Drowneds and fish swimming around in circles

All repros below use [mediaInline]

Repro 1: fish get stuck directly above non-solid blocks

1. Make a 5x5x5 source water chamber with a stone floor.

2. Replace the center stone block with a non-solid-material block (sea lantern, glass, leaves, ice, etc.).
   Spawn a cod on the center block.

Expected result
The fish swims around.

Observed result
The fish does not move.

Repro 2: fish stop and spin in place when moving across non-solid blocks

1. Make a 5x5x5 source water chamber with a stone floor.

2. Replace the center stone block with a non-solid-material block (sea lantern, glass, leaves, ice, etc.).

3. Spawn a cod on one of the 8 stone blocks adjacent to the center block.

4. If the cod starts moving toward any space other than the spot above the center block, kill it an spawn a new one. The bug can only been seen if it tries to swim across the space directly above the non-solid block.

Expected result
The fish swims across the non-solid block and keeps going.

Observed result
The fish stops and spins in place above the non-solid block.

Repro 3: fish get stuck when moving across non-full-height blocks in 1 block deep water

1. Make a 5x1x5 source water chamber with a stone floor.

2. Replace the center stone block with a non-full block (lower slab, mud).

3. Spawn a cod on the center block.

Expected result
The fish swims around.

Observed result
The fish begins to swim but stops at the edge of the block.

Repro 4: fish stop and spin when moving upwards in water 2 blocks deep above mud (MCPE-162241)

1. Make a 5x2x5 source water chamber with a mud floor.

2. Spawn a cod on the center floor block.

Expected result
The fish swims around freely.

Observed result
When the fish tries to ascend from the first layer of water above the mud to the second layer of water, it stops and spins in place.

Repro 5: drowned stop and spin when swimming upwards over sloped terrain towards a targeted entity

1. Make a large water chamber with an inclined floor in the middle.

2. Place blocks a line of blocks sideways across the chamber so that they leave 3-block high water above the inclined floor.

3. Spawn an iron golem on the upper side of the incline chamber. Restrain it so that it cannot move.

4. Spawn a drowned on the lower side of the chamber.

5. If the drowned reaches the golem, kill it and spawn a new one.

Expected result
The drowned moves to the iron golem and attacks it.

Observed result
The drowned sometimes gets stuck spinning when it tries to ascend the incline toward the golem.

I was playing on my bedrock addition, and I came across two drowned. Having nothing better to do I jumped into the water to gain their attention and started hitting them with a stick (the only thing I had on me) and they started glitching. One was spinning around while the other was pushing it into the dirt. Both while trying to attack me.