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

I don’t think the developer left😃 So far 1PW 8 has worked perfectly for me on both my iPad Pro and iPhone. I had hesitated installing it till about a month ago because of the concerns I saw referred to here. There has been no Face ID issue. But I have never reset my settings on any iOS device ever. I don’t know why that would ever be done under any normal circumstances. But that seems to have triggered the issue which seems to be some problem between iOS and 1PW 8. Version 7 was also working properly for me which is why I had not bothered with 8 until recently. I could still revert to it if needed but so far that’s not necessary.