I don't know how to replicate but i found this while swimming in caves i manually flooded. It should work with any underwater cave if you swim long enough (Probably about 30 seconds) and pay enough attention to the roof of the cave in front of you. (For a less complex 'replication,' place a slab a few blocks away when you're 2 blocks down and over from it.)
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Jacie_krece
@Murderous_Madness Environment is for Your OS, Java Version and other in that favor. Use description to write how to reproduce.
Thanks 🙂
P.S. Possibly dupe of MC-131788
I hope that I help. Writen on PC manually.
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@Jan Chudzikowski Thanks, mb.
MC-131788 seems like a different bug. The textures are showing as they should be but the issue is that there's an air pocket beneath the affected blocks even when a water bucket is emptied beneath/ beside that block