Minecraft: Java Edition - Snapshot 20w20b

https://www.minecraft.net/en-us/article/minecraft-snapshot-20w20a

• Added new Game Mode Switcher debug menu

• Added 10 new Nether advancements

• Bug fixes and tweaks to some advancements requirements

• Added new advancement triggers and technical changes

• Fixed an issue that prevented player from teleporting when throwing an ender pearl while mounted

• 20w20b: Fixed an issue with NPE in server utilization