Goats move when there is no player nearby. This causes several issues and is considered a bug per the resolution of MC-47533.
To reproduce, spawn a few pigs and goats, then go into spectator mode. The pigs will not walk around, but the goats will.
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Comments 2
Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MC-263152, as that ticket contains more detailed information and/or has already been triaged by Mojang.
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Brevort
Can confirm. I have added steps to reproduce to this issue and to related issues.