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

it fails and requires master password often (not every time, but seemingly at random). what I've done is left 1Password 7 also installed...and I set 1Password 7 to do the auto population in Safari. but every time I see 1Password 8 update...I will switch back to see if the issue is fixed. I thought IOS16 fixed the issue...but it turned out that it's still there after I left 1Password 8 as the default long enough to run into the issue again.