Flowing water visually slopes up towards waterlogged blocks when it shouldn't, causing several issues

The bug

When flowing water is next to a waterlogged block, and the water shouldn't flow through that waterlogged block, it still looks as if it would.

Also, if you are inside the water stream, you get pushed into the direction the water visually flows. So, it behaves as if the waterlogged blocks weren't actually there and the water would flow through them.

To Reproduce

1. Build the appropriate setup by using the commands provided below.

   /fill ~1 ~ ~1 ~10 ~2 ~5 glass

   /fill ~2 ~1 ~2 ~9 ~2 ~4 air

   /fill ~2 ~1 ~3 ~9 ~1 ~3 minecraft:prismarine_brick_stairs[waterlogged=true,facing=south]

   /setblock ~2 ~1 ~2 water

   /setblock ~9 ~1 ~4 water

2. Observe the flowing water.