Structures not Sticking to Raft

hey im working on a mod to pretty much allow the raft to go below the water surface similar to a submarine you can build on yet any structures placed on it don’t actually stick to the raft they seemingly stay frozen in mid air after i move

I am having the same issue with my Zeppelin raft. I am gong to try just cooking the mod to see if it works in live use. I hope we can get an answer.