Upon updating from snapshot 20w08a to 20w09a mobs dont spawn in the end anymore

I updated this morning to the new snapshot. I remember changing the gamerule doMobSpawning to false beforehand (I like playing peaceful mode with a challenge). I was in the End when I quit last time. When I turned the gamerule back to true Endermen and Shulkers did not spawn. I checked the main island and the outer ones. Mobs DO spawn in the nether and overworld.