Minecraft – How to fix a ticking-tile entity

I tried to boot up my Minecraft test world in the snapshots, and I got a ticking-tile entity error. Here is the crash report:

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 20/03/19 17:29
Description: 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 thread
Stacktrace:
    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: (0,64,-9), Chunk: (at 0,4,7 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Block: Block{minecraft:conduit}[waterlogged=true]
    Block location: World: (0,64,-9), Chunk: (at 0,4,7 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
    at bgf.K(SourceFile:620)
    at vd.a(SourceFile:401)

-- Affected level --
Details:
    Level name: 1.13 TEST WORLD
    All players: 0 total; []
    Chunk stats: ServerChunkCache: 2025
    Level seed: 3997715673040740701
    Level generator: ID 01 - flat, ver 0. Features enabled: true
    Level generator options: {biome:"minecraft:jungle",layers:[{block:"minecraft:bedrock",height:1b},{block:"minecraft:stone",height:3b},{block:"minecraft:sandstone",height:52b}],structures:{}}
    Level spawn location: World: (0,55,0), Chunk: (at 0,3,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
    Level time: 1229280 game time, 1000 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: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
    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: Mac OS X (x86_64) version 10.14.3
    Java Version: 1.8.0_74, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1442840576 bytes (1376 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
    JVM Flags: 8 total; -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    Player Count: 0 / 8; []
    Data Packs: vanilla
    Type: Integrated Server (map_client.txt)
    Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

I followed the instructions of This video
but when I opened the chunk, NBT Explorer Crashed:
NBT Explorer Crashing
Can someone please help? I put hours into that test world and it would be a shame to loose it.
If it's any help, NBTExplorer is in my Downloads folder. Here is my system info:

I ran the world in snapshot 19w12a with NBT Explorer 10.2.3
Someone asked for the world download, so here it is World Download