When I switched to MacOS Ventura awhile back, I noticed the OS started adding a period after a double-space. I turned this off in Keyboard -> Input Sources -> Add period with a double-space, and it's worked for everything except TexShop, which still adds the period.
I thought this would get fixed in an update, but it seems to be hanging on, so I'm wondering if it's just me. Is there something more I need to do to turn it off for TexShop?