Eye of Ender not leaving hand

Some players have reached out about eyes of ender not being thrown even in the overworld. Is there a plugin or setting on servers that could affect that? There is a world border at 24k x 24k blocks, but I dont think the issue is not finding unlooted strongholds. There are unlooted strongholds that players have found without eyes of ender, so I'm not sure what the cause of this is.
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