USB/USB-C combo flash drive mounts and works on Windows and Android, but not macOS

Question

I have a flash drive that supports both USB and USB-C. The problem with this flash drive is that it works on Windows, but not on macOS. Specifically:

• The drive is exFAT-formatted and does not have encryption on it.
• The drive works as expected on both USB ports on Windows.
• This drive also works as expected when connected to my Android phone via USB-C (i.e. directly, not with a cable). I just copied some pet photos onto it.
• The drive did work on macOS at one point; I was able to copy files onto it without issue.
• I cannot mount or format the drive on macOS.
• Running fsck_exfat /dev/disk2s1 on the drive returns the error message fsck_exfat: Can't open /dev/rdisk2s1: Operation not permitted.
• I've backed up the files that the drive contained onto a separate disk drive. These files were copied without incident, and their contents do not appear to be corrupted.

I formatted the drive as ExFAT again, then verified it with H2testw. It reported no errors:

Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 22.6 MByte/s
Reading speed: 86.5 MByte/s
H2testw v1.4

However, FakeFlashTest did identify problems:

FAKEFLASHTEST v1.1.4  [SSi]
[DRIVE 7]     114.5GiB USB SanDisk 3.2Gen1            
FFT - Quick Size Test (destructive)
L:     (no label)   [DRIVE 7]     114.5GiB USB SanDisk 3.2Gen1            

Writing marker blocks to drive 7 at 200MiB intervals.
*** ERROR *** writing to drive at Sector 240316334
WRITE ERROR: Sector = 240316334
WRITE ERROR: Sector = 239906734
WRITE ERROR: Sector = 239497134
WRITE ERROR: Sector = 239087534
WRITE ERROR: Sector = 238677934
WRITE ERROR: Sector = 238268334
WRITE ERROR: Sector = 237858734
WRITE ERROR: Sector = 237449134
WRITE ERROR: Sector = 237039534
WRITE ERROR: Sector = 236629934
WRITE ERROR: Sector = 236220334
WRITE ERROR: Sector = 235810734
WRITE ERROR: Sector = 235401134
WRITE ERROR: Sector = 234991534
WRITE ERROR: Sector = 234581934
WRITE ERROR: Sector = 234172334
WRITE ERROR: Sector = 233762734
WRITE ERROR: Sector = 233353134
WRITE ERROR: Sector = 232943534
WRITE ERROR: Sector = 232533934
WRITE ERROR: Sector = 232124334
WRITE ERROR: Sector = 231714734
WRITE ERROR: Sector = 231305134
WRITE ERROR: Sector = 230895534
WRITE ERROR: Sector = 230485934
WRITE ERROR: Sector = 230076334
WRITE ERROR: Sector = 229666734
WRITE ERROR: Sector = 229257134
WRITE ERROR: Sector = 228847534
WRITE ERROR: Sector = 228437934
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WRITE ERROR: Sector = 228028334
WRITE ERROR: Sector = 227618734
WRITE ERROR: Sector = 227209134
WRITE ERROR: Sector = 226799534
WRITE ERROR: Sector = 226389934
WRITE ERROR: Sector = 225980334
WRITE ERROR: Sector = 225570734
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WRITE ERROR: Sector = 224751534
WRITE ERROR: Sector = 224341934
WRITE ERROR: Sector = 223932334
WRITE ERROR: Sector = 223522734
WRITE ERROR: Sector = 223113134
WRITE ERROR: Sector = 222703534
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WRITE ERROR: Sector = 221884334
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WRITE ERROR: Sector = 221065134
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WRITE ERROR: Sector = 220245934
WRITE ERROR: Sector = 219836334
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WRITE ERROR: Sector = 219017134
WRITE ERROR: Sector = 218607534
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WRITE ERROR: Sector = 217788334
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WRITE ERROR: Sector = 216149934
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WRITE ERROR: Sector = 214511534
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WRITE ERROR: Sector = 212873134
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WRITE ERROR: Sector = 211644334
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WRITE ERROR: Sector = 210825134
WRITE ERROR: Sector = 210415534
WRITE ERROR: Sector = 210005934
WRITE ERROR: Sector = 209596334
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WRITE ERROR: Sector = 207957934
WRITE ERROR: Sector = 207548334
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WRITE ERROR: Sector = 206729134
WRITE ERROR: Sector = 206319534
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WRITE ERROR: Sector = 205500334
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WRITE ERROR: Sector = 203861934
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WRITE ERROR: Sector = 201813934
WRITE ERROR: Sector = 201404334
WRITE ERROR: Sector = 200994734
WRITE ERROR: Sector = 200585134
WRITE ERROR: Sector = 200175534
WRITE ERROR: Sector = 199765934
WRITE ERROR: Sector = 199356334
WRITE ERROR: Sector = 198946734
WRITE ERROR: Sector = 198537134
WRITE ERROR: Sector = 198127534
WRITE ERROR: Sector = 197717934
WRITE ERROR: Sector = 197308334
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WRITE ERROR: Sector = 196489134
WRITE ERROR: Sector = 196079534
WRITE ERROR: Sector = 195669934
WRITE ERROR: Sector = 195260334
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WRITE ERROR: Sector = 194441134
WRITE ERROR: Sector = 194031534
WRITE ERROR: Sector = 193621934
WRITE ERROR: Sector = 193212334
WRITE ERROR: Sector = 192802734
WRITE ERROR: Sector = 192393134
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WRITE ERROR: Sector = 191983534
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WRITE ERROR: Sector = 191164334
WRITE ERROR: Sector = 190754734
WRITE ERROR: Sector = 190345134
WRITE ERROR: Sector = 189935534
WRITE ERROR: Sector = 189525934
WRITE ERROR: Sector = 189116334
WRITE ERROR: Sector = 188706734
WRITE ERROR: Sector = 188297134
WRITE ERROR: Sector = 187887534
WRITE ERROR: Sector = 187477934
WRITE ERROR: Sector = 187068334
WRITE ERROR: Sector = 186658734
WRITE ERROR: Sector = 186249134
WRITE ERROR: Sector = 185839534
WRITE ERROR: Sector = 185429934
WRITE ERROR: Sector = 185020334
WRITE ERROR: Sector = 184610734
WRITE ERROR: Sector = 184201134
WRITE ERROR: Sector = 183791534
WRITE ERROR: Sector = 183381934
WRITE ERROR: Sector = 182972334
WRITE ERROR: Sector = 182562734
WRITE ERROR: Sector = 182153134
WRITE ERROR: Sector = 181743534
WRITE ERROR: Sector = 181333934
WRITE ERROR: Sector = 180924334
WRITE ERROR: Sector = 180514734
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WRITE ERROR: Sector = 180105134
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WRITE ERROR: Sector = 179285934
WRITE ERROR: Sector = 178876334
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WRITE ERROR: Sector = 178057134
WRITE ERROR: Sector = 177647534
WRITE ERROR: Sector = 177237934
WRITE ERROR: Sector = 176828334
WRITE ERROR: Sector = 176418734
WRITE ERROR: Sector = 176009134
WRITE ERROR: Sector = 175599534
WRITE ERROR: Sector = 175189934
WRITE ERROR: Sector = 174780334
WRITE ERROR: Sector = 174370734
WRITE ERROR: Sector = 173961134
WRITE ERROR: Sector = 173551534
WRITE ERROR: Sector = 173141934
WRITE ERROR: Sector = 172732334
WRITE ERROR: Sector = 172322734
WRITE ERROR: Sector = 171913134
WRITE ERROR: Sector = 171503534
WRITE ERROR: Sector = 171093934
WRITE ERROR: Sector = 170684334
WRITE ERROR: Sector = 170274734
WRITE ERROR: Sector = 169865134
WRITE ERROR: Sector = 169455534
WRITE ERROR: Sector = 169045934
WRITE ERROR: Sector = 168636334
WRITE ERROR: Sector = 168226734
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WRITE ERROR: Sector = 167817134
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WRITE ERROR: Sector = 166997934
WRITE ERROR: Sector = 166588334
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WRITE ERROR: Sector = 165769134
WRITE ERROR: Sector = 165359534
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WRITE ERROR: Sector = 162492334
WRITE ERROR: Sector = 162082734
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WRITE ERROR: Sector = 160444334
WRITE ERROR: Sector = 160034734
WRITE ERROR: Sector = 159625134
WRITE ERROR: Sector = 159215534
WRITE ERROR: Sector = 158805934
WRITE ERROR: Sector = 158396334
WRITE ERROR: Sector = 157986734
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WRITE ERROR: Sector = 155938734
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WRITE ERROR: Sector = 141193134
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WRITE ERROR: Sector = 140373934
WRITE ERROR: Sector = 139964334
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WRITE ERROR: Sector = 135868334
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WRITE ERROR: Sector = 134229934
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WRITE ERROR: Sector = 130953134
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WRITE ERROR: Sector = 130133934
WRITE ERROR: Sector = 129724334
WRITE ERROR: Sector = 129314734
WRITE ERROR: Sector = 128905134
WRITE ERROR: Sector = 128495534
WRITE ERROR: Sector = 128085934
WRITE ERROR: Sector = 127676334
WRITE ERROR: Sector = 127266734
WRITE ERROR: Sector = 126857134
WRITE ERROR: Sector = 126447534
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WRITE ERROR: Sector = 125628334
WRITE ERROR: Sector = 125218734
WRITE ERROR: Sector = 124809134
WRITE ERROR: Sector = 124399534
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WRITE ERROR: Sector = 123580334
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WRITE ERROR: Sector = 122761134
WRITE ERROR: Sector = 122351534
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WRITE ERROR: Sector = 114159534
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WRITE ERROR: Sector = 104329134
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WRITE ERROR: Sector = 103100334
WRITE ERROR: Sector = 102690734
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WRITE ERROR: Sector = 101461934
WRITE ERROR: Sector = 101052334
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WRITE ERROR: Sector = 99004334
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WRITE ERROR: Sector = 92860334
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WRITE ERROR: Sector = 90812334
WRITE ERROR: Sector = 90402734
WRITE ERROR: Sector = 89993134
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WRITE ERROR: Sector = 89173934
WRITE ERROR: Sector = 88764334
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WRITE ERROR: Sector = 86716334
WRITE ERROR: Sector = 86306734
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WRITE ERROR: Sector = 80572334
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WRITE ERROR: Sector = 78524334
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WRITE ERROR: Sector = 77705134
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WRITE ERROR: Sector = 76476334
WRITE ERROR: Sector = 76066734
WRITE ERROR: Sector = 75657134
WRITE ERROR: Sector = 75247534
WRITE ERROR: Sector = 74837934
WRITE ERROR: Sector = 74428334
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WRITE ERROR: Sector = 15855534
WRITE ERROR: Sector = 15445934
WRITE ERROR: Sector = 15036334
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Memory tested in blocks of 409600 sectors [586sectors checked].

BAD MEMORY from sector 700334 (341.9599MiB) to sector 240316334 (117,341.9599Mib)

WARNING: no memory detected at one or more locations.
Test took 4 seconds.
586 sectors checked.
                         *** FAILED ***

DEVICE HAS DUPLICATE OR BAD BLOCKS!

Recommended maximum usable partition size: 141.9599Mib (approx. Last good Sector=700334)

Unplug and re-connect the drive, then reformat it using Windows or RMPrepUSB.

Any tips?