I made a copy of my main survival world and loaded it up in the latest snapshot, only to have the game crash with an error about my character's NBT data.

Here's my crash log:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Surprise! Haha. Well, this is awkward.
Time: 4/2/20 3:09 PMDescription: Loading entity NBT
java.lang.NullPointerException: Loading entity NBT at lk.a(SourceFile:168) at ky.a(SourceFile:150) at aoh.a(SourceFile:119) at aof.a(SourceFile:185) at aog.a(SourceFile:106) at aog$$Lambda$3455/150479253.accept(Unknown Source) at v.a(SourceFile:339) at aog.a(SourceFile:102) at ann.a(SourceFile:606) at bch.a(SourceFile:822) at yl.a(SourceFile:229) at anc.f(SourceFile:1616) at aav.a(SourceFile:308) at aav.a(SourceFile:127) at ze.c(SourceFile:111) at ze.b(SourceFile:63) at ly.a(SourceFile:230) at zb.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:864) at net.minecraft.server.MinecraftServer.a(SourceFile:791) at ell.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:650) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at lk.a(SourceFile:168) at ky.a(SourceFile:150) at aoh.a(SourceFile:119) at aof.a(SourceFile:185) at aog.a(SourceFile:106) at aog$$Lambda$3455/150479253.accept(Unknown Source) at v.a(SourceFile:339) at aog.a(SourceFile:102) at ann.a(SourceFile:606) at bch.a(SourceFile:822) at yl.a(SourceFile:229)
– Entity being loaded --Details: Entity Type: minecraft:player (yl) Entity ID: 374 Entity Name: Flexico64 Entity's Exact location: -703.42, 65.00, 1699.86 Entity's Block location: World: (-704,65,1699), Chunk: (at 0,4,3 in -44,106; contains blocks -704,0,1696 to -689,255,1711), Region: (-2,3; contains chunks -64,96 to -33,127, blocks -1024,0,1536 to -513,255,2047) Entity's Momentum: 0.00, -0.08, 0.00 Entity's Passengers: [] Entity's Vehicle: ~_ERROR~ NullPointerException: nullStacktrace: at anc.f(SourceFile:1616) at aav.a(SourceFile:308) at aav.a(SourceFile:127) at ze.c(SourceFile:111) at ze.b(SourceFile:63) at ly.a(SourceFile:230)
– Ticking connection --Details: Connection: ly@3b6d8607Stacktrace: at zb.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:864) at net.minecraft.server.MinecraftServer.a(SourceFile:791) at ell.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:650) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 20w14a Minecraft Version ID: 20w14a Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 4284760224 bytes (4086 MB) / 6333399040 bytes (6040 MB) up to 6442450944 bytes (6144 MB) CPUs: 8 JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx8G -Xmn6G -XX:PermSize=256M Player Count: 0 / 8; [] Data Packs: vanilla, file/stonecutter_cuts_wood+v.+1.0.zip (incompatible), file/Coordinates.zip (incompatible), file/Artist_1.14.zip (incompatible), file/silk-touch-spawners-v1-3-1565027733.zip (incompatible), file/Useful Things.zip, file/Craftable Spawn Eggs Build-1.zip (incompatible) Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.