From previous work by others (silentwisperer, et. al.) there are only 25 locations in an ocean monument that can spawn guardians. Guardians are supposed to require water to spawn. As shown in the attached *.mcworld file, guardians will spawn on solid blocks at these locations with no water present.
Expected: Guardians should not spawn without the presence of water.
Bug: Guardians spawn on solid blocks in air.
Notes:
The attached world is from silentwisperer's guardian farm video https://www.youtube.com/watch?v=14j8YH7YGNY
Guardians are spawning on both prismarine and acacia wood, i.e. the buggy spawning does not require temple blocks.
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I can confirm that this bug occurs on Realms and Xbox One. Both are on 1.8 currently.
The attached images (Setup.png, Result.png) are taken in Windows 10 Edition via LAN with the Xbox world.
Repro Steps:
1) Find an ocean monument (/locate monument)
2) Go to it and use fill command to replace the top four layers (60 - 63 inclusive) with a solid block of choice. Fill in one block extra to the sides as well (for a total dimension of 60 x 4 x 60)
3) Use fill command to replace top 3 layers (61 - 63 inclusive) with air. Leave the extra border of solid blocks around the side to keep water from flowing in. Air space dimensions 58 x 3 x 58.
4) Go to a y value of at least 90 and observe the spawning guardians in air. If you can't get any to spawn, set a command block to constantly kill all entities which are not guardians. ( /kill @e[type=!guardian] ). Alternatively, toggle peaceful mode on and off till you have spawning.
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Confirmed on Android, 1.10.0.4
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Still an issue in public release of 1.10.0
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I can confirm this on Bedrock with Xbox one version (whatever the latest is as of 3/25/19 since 10 minutes of fiddling didn't reveal a way to get the version number?). I built a cofferdam around a monument all of the way to the surface and drained it (on survival 😞) and am in the process of flush decking the monument (leaving only the floor) and I've got guardians bouncing around everywhere.
[Mojang] Mega_Spud (Jay)
This bug is fixed in the latest beta version, and the fix will be included in a future update when that is ready for full release (no specific date can be given). We will leave this ticket open as a point of reference until the fix has been fully released.
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Confirmed fixed in release 1.11. And without breaking other things, so great work by the devs here.