Face ID Not Working [Fixed. Please see the approved answer for details.]

For me, at least, 1Password7 does not fix the problem. Removing and reinstalling 1Password7 will fix it for a week or so but it will just come back. Over and over. Every time I reinstall 7 the problem goes away but it always comes back. This is on a completely up to date, new this August, iPhone 13. I reinstalled 7 again a week or so again because Face ID has again stopped working. I just now went to log into something on my iPhone and Face ID isn't working in 1Password7. Again. So I came back here to see if there was any news but I guess not. Face ID works in every other app that uses it (including notoriously terrible ones like AT&T's) on my phone but not 1Password.

Please, please, please fix this. I've been a 1Password user since 2007 and I'd rather not leave but having something basic like this not work for four months on something I am paying a (not cheap) subscription for is just not acceptable. It really isn't. How can 1Password not get this?