Since a few snapshots (I think 20w21a) Guardians dont spawn anyomre. Not arround my farm and not arround the Monument which was never touched by me.
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MMK21
Duplicate of MC-184740
galaxy_2alex
MC-186096 actually - please read the moderator note on that ticket, and please take this advice: In the future, please accept that playing with snapshots or prereleases comes at the risk of things breaking.