I have been using that world since roughly 1.13 and I have been unable to enter it with the current snapshot. Snapshot 19w11b still works.

Here is the crashlog:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Who set us up the TNT?
Time: 20/03/19 15:57Description: Ticking block entity
java.lang.NullPointerException: Ticking block entity at ev.<init>(SourceFile:52) at bso.i(SourceFile:194) at bso.g(SourceFile:104) at bgf.K(SourceFile:620) at vd.a(SourceFile:401) at net.minecraft.server.MinecraftServer.b(SourceFile:816) at net.minecraft.server.MinecraftServer.a(SourceFile:755) at dwc.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:630) 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 ev.<init>(SourceFile:52) at bso.i(SourceFile:194) at bso.g(SourceFile:104)
– Block entity being ticked --Details: Name: minecraft:conduit // bso Block: Block{minecraft:conduit}[waterlogged=true] Block location: World: (-118,58,-86), Chunk: (at 10,3,10 in -8,-6; contains blocks -128,0,-96 to -113,255,-81), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Block: Block{minecraft:conduit}[waterlogged=true] Block location: World: (-118,58,-86), Chunk: (at 10,3,10 in -8,-6; contains blocks -128,0,-96 to -113,255,-81), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)Stacktrace: at bgf.K(SourceFile:620) at vd.a(SourceFile:401)
– Affected level --Details: Level name: Home All players: 1 total; [ve['ThatRiversideGuy'/379, l='Home', x=-128.70, y=41.00, z=-124.36]] Chunk stats: ServerChunkCache: 2025 Level seed: -5411501280135535879 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (-96,76,16), Chunk: (at 0,4,0 in -6,1; contains blocks -96,0,16 to -81,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511) Level time: 7177200 game time, 267255 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: falseStacktrace: at net.minecraft.server.MinecraftServer.b(SourceFile:816) at net.minecraft.server.MinecraftServer.a(SourceFile:755) at dwc.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:630) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 19w12a 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: 921550976 bytes (878 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Player Count: 1 / 8; [ve['ThatRiversideGuy'/379, l='Home', x=-128.70, y=41.00, z=-124.36]] Data Packs: vanilla, file/Zombie_Leather_1.0 [1.13].zip (incompatible), file/Double Shulker Shells (incompatible), file/Dragon Drops Elytra (incompatible), file/more_mob_heads (incompatible) Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.