I'd love an option that fixes some of the issues with bedrock-less wither cages. For example dealing with the wither losing its target when you unload it, as ilmango explains here.

There may be other things that could be done to make wither cages less fragile, but I'm no expert.

well, if you wanna disable blue skulls altogether is just to change them to black ones with the same velocity. And i'm pretty certaind the wither's target is stored in its nbt

I've created a mod that fixes this and optionally disables blue skulls, it's on CurseForge, still pending approval.
Feel free to merge it into carpet-extra if you'd like.

it would make sense only as a feature that disables blue wither skulls altogether - as a stupid, useless feature to make life harder for wither trappers. I would suggest that for carpet extra

I'm not sure I understand. Are you saying the blue skulls are just there to make life harder for wither trappers?

Perhaps the best way to deal with this is to store the withers target when it is saved and reloaded.

If that's reasonable to implement that would be amazing.

No longer pending approval.