Can't confirm, i have been taking screenshots in 1.15.2 and it is working just fine for me. Can you give some steps of how to replicate this bug or is it just "take a screenshot"
I played a little bit and I did not seem to have any problems. I will contact you if I have anymore.
Thanks!
A further observation would be that this particular issue does not seem to be present in the java version of the game, which indicates that this is also a parity issue.