waterloggable blocks in Trail Chamber not supposed to be waterlogged

I explored this trail Chamber in Survival, and in one room it was flooded. not really playable.
On the top there where Waterlogged waxed_cut_copper_slab. I think this room generated inside of a Watercave. 

Reproduce:

Look at the Screenshot, there are Seed and coordinates.

make sure to generate this in 24w13a I just updated it to the newest version today.