This may be intended behavior for hostile mobs in Peaceful difficulty, but this causes all Ocean Monuments in a world to lack Elder Guardians upon switching to Peaceful, as Elder Guardians do not respawn.
Steps to Reproduce
1. Spawn or summon an Elder Guardian
2. If on Easy difficulty or harder, change to Peaceful
--> Elder Guardian does not spawn on Peaceful, or despawns upon switching to Peaceful.
Expected Results
This may have negative implications on unexplored Ocean Monuments as Elder Guardians may no longer be present, as they cannot respawn upon switching out of Peaceful. Elder Guardians should not despawn in Peaceful difficulty but rather follow the behavior of Vindicators and Evokers in Woodland Mansions - turning passive in Peaceful.
Linked issues
is duplicated by 1
Attachments
Comments 13

May be related to MCPE-16991.
May be related to MCPE-16991.
Can confirm that this issue still affects the latest beta.
Steps to Reproduce:
1. Create a new world (Recommended to use Creative Mode w/ Cheats enabled)
2. Locate an Ocean Monument
3. Find an Elder Guardian
4. Enter the Pause menu < Game < Difficulty < Peaceful
Observed Results:
The Elder Guardian disappears
Expected Results:
The Elder Guardian remains.
[media]
[media]
Based on MCPE-36692 it is very likely WAI.
Based on MCPE-36692 it is very likely WAI.
Thank you for your report!
However, this issue is Working as Intended.
Directly copying the comment from MCPE-36692:
Elder guardians don't respawn, they are generated with the structure.
"Three elder guardians spawn naturally during the generation of each ocean monument: one in the top room of the monument and the other two in each wing section of the monument. They will not respawn after their initial spawn, thus there are a limited number of them per world. Elder guardians spawned with monuments do not naturally despawn, although they will be removed along with other hostile mobs in peaceful difficulty." https://minecraft.gamepedia.com/Elder_Guardian#Spawning
Also see MC-58562 or similar tickets.
Quick Links:
📓 Bug Tracker Guidelines – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
However, this issue is Working as Intended.
Directly copying the comment from MCPE-36692:
Elder guardians don't respawn, they are generated with the structure.
"Three elder guardians spawn naturally during the generation of each ocean monument: one in the top room of the monument and the other two in each wing section of the monument. They will not respawn after their initial spawn, thus there are a limited number of them per world. Elder guardians spawned with monuments do not naturally despawn, although they will be removed along with other hostile mobs in peaceful difficulty." https://minecraft.gamepedia.com/Elder_Guardian#Spawning
Also see MC-58562 or similar tickets.
Quick Links:
📓 Bug Tracker Guidelines – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki