Waila, The One Probe, and similar mods easily give away that the block is a sneaky block.

The sneaky blocks are already hidden in Waila. The player who placed the sneaky block can still identify that it is a sneaky block, to help them keep track of it, but other players will see the held block.

Ok, thanks, I didn't realize that.

If I get around to adding TOP support, I will be sure to add this. Will leave open for now.

Given how much trouble TOP has been giving me, I no longer plan to add support at this time.