Shulkers aren't respawning in the end cities.
Comments 3
Thank you for your report!
However, this issue has been closed as Working as Intended.
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They are not supposed to respawn. From wiki:
"Shulkers spawn during the generation of end cities, which are located on the outer islands of the End. They usually spawn on the walls of the city and on end ships. They do not despawn naturally, even in Peaceful difficulty, and once killed, they do not respawn unless spawners are used."