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That does not appear to be the case.

There is a video circulating these comments. It shows someone register their finger without the screen, slap the screen protector over top and unlock with a different, previously rejected finger.

Edit: https://twitter.com/sta_light_/status/1184475413252210688?s=...

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If the fingerprint somehow gets embedded into the screen protector, is it possible that the screen protector is "tainted" with the fingerprint from previous usage?

I'm not dismissing the claims, but I would like to see if the behavior can be replicated with a brand new screen protector.

Yes, 100% agreed.

Yes, I saw that and it definitely made me rethink my theory. Either it's trapping a fingerprint under the protector or this is not the first run with the screen protector and it's "tainted" with a fingerprint in it now.

I'm unusually eager to know the full story!

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