When I try to start server.jar on 20w20a, I am getting the NullPointerException below.  It launches fine on 20w19a.  Rebooted PC hosting server for troubleshooting, but it didn't have any effect.  Able to reproduce on both Windows and Linux.

PS C:\Users\shaun\minecraft_KidKraft> java -Xmx1024M -Xms1024M -jar .\server.jar

[15:02:22] [main/ERROR]: Unable to bootstrap registry 'minecraft:entity_type'
[15:02:22] [main/ERROR]: Unable to bootstrap registry 'minecraft:feature'
Exception in thread "main" java.lang.ExceptionInInitializerError
at gl.H(SourceFile:94)
at gl.a(SourceFile:132)
at java.util.LinkedHashMap$LinkedEntrySet.forEach(Unknown Source)
at gl.<clinit>(SourceFile:131)
at aoc.a(SourceFile:144)
at aoc.<clinit>(SourceFile:150)
at ckx.<clinit>(SourceFile:23)
at cka.<clinit>(SourceFile:64)
at cqg.<clinit>(SourceFile:77)
at cif.<clinit>(SourceFile:64)
at net.minecraft.server.MinecraftServer.<clinit>(SourceFile:179)
Caused by: java.lang.NullPointerException
at bsh.<init>(SourceFile:44)
at bqk.<clinit>(SourceFile:9)
... 11 more
PS C:\Users\shaun\minecraft_KidKraft>