AW9 updated to 10.5 and then extreme battery drain. On March 28th, I followed Jeff Donald's excellent advice (reset, unpair/pair), and the battery drain issue was resolved. (Thank you again, Jeff!)
Since then I've noticed two changes:
1) the battery drains more quickly than before 10.5 (but nothing crazy), so I'm going to keep checking that;
2) FIND MY has become erratic on the AW. Now when I leave my workplace (where I leave an MBAir), Find My "Notice" (often audio on Airpods Pro2) sometimes (not always) tells me I've left two items behind in my workplace. Nope, only the MBA, but it seems to include my AW, which is on my wrist. My AW and iPhone have both been in use for at least a few minutes before this, so I wonder if the Find My functions were altered with the 10.5 update.
I don't know what Apple is going to do, but lots of Apple Watch owners are experiencing problems because of (not just after...) the 10.5 update, so Apple needs to respond and make this right ASAP.