I tried to use the exchanging gadget to replace some logs in my floor with diamond honeycombs. It crashed after the exchange animation, but the world managed to save. The blocks had been replaced with some kind of corrupt honeycomb block that was pure black with no texture or lighting. Trying to replace some non-corrupt honeycomb blocks with endstone using the exchange tool caused another crash. The blocks were not replaced.

I also noticed after the second crash that the corrupt blocks near torches were lit yellow. Breaking the torches made them black again, but replacing torches didn't light them up again.

Productive Bees blocks have been blacklisted in the building gadget to fix this in 0.4.34.