Glass and water logged slabs

When a glass block is placed on top of a water logged stair/slab, the texture of the water renders through the logged block.

 

*disclaimer: the custom textures I’m using in the pictures are not the cause.

 

To prove this is a bug, have I provided screenshots from another device WITHOUT any 3rd party textures.

The bug only occurs when the water logged stair/slab is surrounded by full blocks.