Underwater effect is shown when flying directly underneath waterlogged slabs and stairs

Summary:
When flying directly underneath a waterlogged slab and stair, the underwater effect is shown.

Steps to Reproduce:

1. Place a slab/stair in the air
2. Surround the sides of the slab/stair with solid blocks
3. Waterlog the slab/stair
4. Fly directly underneath the slab/stair

Observed Results:
The underwater effect is shown.

Expected Results:
The underwater effect should not be shown.

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Original Description;
when placed in air like in the attached video's, you can get a weird underwater effect while standing directly under the slab/stair. when removing the slab/stair from the same position, the water will remain floating.