A rare bug, when pillagers shoot at a player who is in creative mode. I do not know how this bug happens

When I was playing minecraft, I came across an outpost of pillagers. I built a tower to kill robbers and gain experience, I've killed a lot of them, 50 pieces. I entered the tower, but I forgot to do something. I come out of the tower and see that the robbers are shooting at me, despite the fact that I was in creative mode. It was also on snapshots 1.19.