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*What I expected to happen was not to have hostile mobs spawn one peaceful
*What actually happened was a skeleton spawned
I was testing the new elytra on peaceful, when I saw a skeleton with no AI just stand in the dark.
Don't know how to trigger it, i was just going around in a custom world with a lot of high places. Ground level was 217. And I had Night Vision
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I got a method to recreate this bug at least:
-i made it on a flat world to restrict the spawn locations.
-set the time to 0.
-build a box 63x5x52, with the north wall open to look inside.
-set difficult to 1. then wait some seconds to gather some subjects.
-set difficult to 2. then 3. after that set the difficult to 0.
with some tries i trigger the bug. 🙂 about 10min to make it 2 times.
sorry for the bad english.

Likely related to MC-89923.