While messing around with the new crafter, I ended up needing two comparator watching the same block : one as a clock (which work fine) and a second one (which get stuck powered until refreshed manually).

I've managed to make a simple setup to reproduce the bug, see screenshot attached.

do note that, in this setup, we need to leave every square of the crafter unlocked.

By putting a small stack of items (for example golds blocks) into the crafter, it start working until it's empty (as expected). However, the second comparator (the one idle) stay powered despite the crafter being empty. Updating the block bring it back to normal.

By trying the same experiment, but with a dropper/dispenser instead of the crafter, we observe the expected behavior, with both comparator getting unpowered once the dropper is empty.