Fish stop swimming after a while.

After exploring an Ocean temple I noticed the Salmon just stopped moving. Staying still in the water. This kind of kills the effect of the ocean teeming with life with this issue.

What I expected to happen was:
The fish would endlessly keep swimming around.

What actually happened was:
After a while, they stopped and stood there.

Steps to Reproduce:
Go to the ocean; Preferably a Warm Ocean with a Coral Reef.
Observe the fish as they glide around
Eventually, this happens: https://drive.google.com/file/d/19QD8wqCv7D7Ldq6UWvKKy7odwUPwV3DW/view?usp=sharing