Whenever I try looking directly at a starfish with WTHIT it makes the game crash. If I remove WTHIT it doesn't crash anymore. I'm playing in the 1.17.1 version.

Same for me.

Having the same problem, crash log attached
crash-2021-09-22_08.03.19-client.txt

can confirm still happens with wthit v3.9.3

This also applied when picking the starfish in Creative mode.
It's been fixed in the latest release, sorry for the long wait, and thanks for reporting everyone <3!