Weird glitch in chunk

So it started when i took some red alloy scraps from the crucible

So its a block update thing i guess?
heres some more

also file size is 34mb idk why it wont let me add it here

Disabling multicore rendering fixes it but wtf i never had to what changed

Ok its not disabling per say i cycled it back to multicore and it fixed
I bet its not even gt related