Underwater View Shows When Jumping Under A Waterlogged Slab

Steps to reproduce the issue

1.Open Minecraft

2.Place a waterlogged slab with a one block gap in between a player’s head.

(3.Place a lantern or a small block that is smaller than a slab)←Not sure if this is causing the problem. Added it just to make sure

4.Jump under the slab. You’ll get a underwater view when

Expected result

Nothing happens. No underwater view when your head touches the slab.

Actual result

Underwater view when jumping beneath a waterlogged slab shown in video and photo. but does not give the underwater status(no suffocating)