I was playing the latest snapshot and I was playing around with Pillagers. I switched to survival to test something else, and then went back to creative. I thought it would stop attacking me.

It turns out, it kept attacking me. I turned my difficulty to hard to know it was shooting me since they are more accurate in hard mode, and boom, he was shooting at me.

To recreate the bug

1. Spawn a pillager
2. Go into survival mode
3. Switch back to creative

(P.S. I just tried to recreate the bug again and it didn't work. I don't know if it is under specific circumstances, but If I need to provide more info I can)