When placing stairs or slabs underwater, if the block beneath them is an air block, the block does not become waterlogged.
MC-127209
Stairs and slabs do not become waterlogged with air block underneath
Resolved
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Unable to reproduce. Remember that only watersource become waterlogged blocks. Probably there was no water source above hole - just nonsource block of water. Filling gap below with glasspane enabled to create watersource above, so placing slab there created waterlogged block.
You can notice this by removing glass pane, then removing waterlogged block above (now there is nonsource water) - place slab back - it will create air pocket. Remove slab, place glass below (now water above is source), remove glass below (still water above is source), place slab back - no air, it's waterlogged.