I seem to be having a similar problem. I was testing the range of creeper scaring in a creative v1.14.30 on the windows 10 edition and i ran into the problem that the cats, who were just in a sitting position, didn't scare creepers except in one direction. in every other direction, creepers that were spawned even 1 block away from the cat didn't move at all, even after watching them a bit from a distance
Video: https://youtu.be/YMUedMrHSKM
I haven't seen it outside a realm, but it might also happen outside of them. we don't have any mod packs or anything, and getting rid of objects did nothing. I Others on my realm have been having furnace glitches, and if you go into the furnace they don't have any items besides fuel, and are off, but the progress arrow is halfway full and stuck