When i try to spawn a endermite it despawning instantly (in creative with the egg generator and on survival mode with the ender perls) but when i try to do the same thing in other world it does'nt happendmthe endermite did not disappear PLEASE HELP

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
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