I wasn't really sure if I should report the bug / incompatibility here or on the computercraft mod but I will try it here first.
As soon as a Turtle from Computercraft tries to break and or place blocks in claimed chunks, the server crashes instantly.

Crash logs:
crash-2022-07-10_16.04.32-server.txt
crash-2022-07-09_11.47.35-server.txt

If more information is needed, let me know.

PS: I know we're running version 0.5.0 and you released 0.5.1, thou I didn't saw any patch notes for CC for 0.5.1 and I update the modpack in a bulk every week since I need to send it to my Alpha testers every time I change the modpack.

Thanks! You reported it in the right place.
Going to be fixed soon.