This reminds me of an incident on my family creative server. Although the world was on peaceful difficulty, I heard weird noises in a certain dark forest grove next to a fox habitat. I was frightened by that place, and was almost convinced that some sort of creepypasta entity was in there. It turned out that my sister had built an underground room and put a shulker in it; they're the only hostile mob allowed in peaceful mode on Bedrock Edition.