Enderman doesn't attack endermites spawned by egg or /summon. They only get aggressive at endermites spawned with enderpearl.
Linked issues
Comments

Enderman doesn't attack endermites spawned by egg or /summon. They only get aggressive at endermites spawned with enderpearl.
Giorgio Cheles
(Unassigned)
Unconfirmed
(Unassigned)
20w21a
Retrieved
Thank you for your report!
However, this issue is a Duplicate of MC-53518.
Please use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki