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Unicopia's new update has been fixed. Mimics are configurable now via the mod itself. My datapack is no longer needed and I am not certain if it still hooks into the mod, but if it works it works.
Better Days mod, which handles the sleeping seems to be misbehaving. May be removed next update if I cannot fix with configs or what else. My assumption is that mods like unicopia likes handling the same processes.

A large Pony Themed Modpack+Server with adventure and RPG elements in mind.