For some reason endermans don't attack endermites
Video of the issue:
https://medal.tv/games/minecraft/clips/1zcT3CqGZ0V6dQ/d13377HTG1Ot?invite=cr-MSx6YnUsMTQ4MDUxMjAs
(mods in the video: Curios API (Forge),
Dungeons Libraries, Dungeons Mobs, GeckoLib).