Closely relates to its Java Edition equivalent MC-135789.

The bug

The texture a flowing liquid uses on its bottom face will be the still texture, despite this being misleading due to the liquid in question not being still at all. The flowing texture, rotated accordingly, would be expected.

How to reproduce

1. Create a platform of glass
2. Place water on this platform
3. Observe from below

Expected results

The top and bottom of the water would use the flowing water texture.

Actual results

Only the top uses the flowing water texture - the bottom uses the still water texture.