Fish Spawning in Water

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Fish if I spawn them in water stay same spot never spread out. I am admin in solo play. that all words can explain this bug.

Game mode: Official Testlive | Private Testlive | Singleplayer
Problem: Crash | Bug | Performance | Misc
Crash dump link: (if applicable - fill out the crash report and enter your email to get the link)

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Repro steps: