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No, Face ID takes another snapshot after the passcode has been entered.

Source: "Face ID takes another capture and augments its enrolled Face ID data" https://images.apple.com/business/docs/FaceID_Security_Guide...

colinzoyon Reverse Engineering MacOS High Sierra Supplemental Update

1. to me the most important question is: why on earth can the disk password be retrieved in clear text in the first place ?!

2. also: the buggy version will be able to show disk passwords forever, until the encryption scheme is changed. macOS native encryption is useless until then (but given 1., it might already have been for some time).