Whenever I waterlog stairs, slabs etc. the game sometimes "forgets" they were waterlogged and I have to waterlog them again. This has become very frustrating when building underwater. I don't know if this affects all waterlogged blocks, but I see it with prismarine, quartz, and stonebrick.
Another issue that I've seen is that when inside underwater buildings, I get blue visual glitches on waterlogged blocks. However, it's only when I'm further away. When I get close, they go away.
Only one issue per ticket please.
About the first issue, more information about that is needed. When do the blocks "forget" that they're waterlogged? Please provide exact steps with which we can reproduce the problem.
The second issue is MC-127004.