Endermites utilize a Lifetime tag to despawn them after a set amount of time. PersistenceRequired tag can not prevent this, despite the purpose being to prevent natural forms of despawning.
CustomName tag works similarly, but PersistenceRequired should function the same. CustomName is somewhat roundabout compared to it.
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Comments 5
Forgot to fix my typos here, but yes, the correct tag won't work. Defeats the purpose of its existence. CustomName works similarly, but PersistenceRequired should as well.
Is this still a concern in the current Minecraft version 14w21b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
The correct tag name is "PersistenceRequired", but is still not involved in keeping the Endermite from despawning. Instead, the "CustomName" tag, when not empty, will prevent the "Lifetime" tag from incrementing. Though I agree that "PersistenceRequired" should be the deciding factor for this.