this has happend before and is game breaking. last time it happend it changed into trapdorrs and catalysts which made a redstone clock that made sound from dors thyat got a redstone signal from catalyst in an eternal loop caused mayor game lag and broke one of our worlds, and now it happend again. pls solve this

Can you elaborate on what updates you made? Did you update your version of Minecraft as well?

adding new mods or updating mods that add new blocks, it seems to have something todo with a shift in block ids. but i dont see why ONLY the mineshafts are effected

After updating modpack too, i found on server is lagging and we now had thousands of calibrated sculk sensors. After replacing them with stone it's fine, but pretty wild bug. One of the first thoughts was, someone is enjoying op and griefing
MC 1.20.1, Forge 47.3.7