"Ticking entity" crash with multiple raids

By using commands to give myself Bad Omen, I summoned multiple simultaneous raids at a small player-built village. The raids proceeded for a while with iron golems fighting the illagers, but the game crashed. I did the same thing on a superflat world with an even smaller village, and the same thing happened.

19w12b\: [^crash-2019-03-21_20.22.09-server.txt]

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 3/21/19 8:22 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at awb$b.e(SourceFile:267)
	at ann.e(SourceFile:55)
	at alz$$Lambda$2877/1012588104.accept(Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at alz.a(SourceFile:80)
	at aii.cX(SourceFile:615)
	at aih.k(SourceFile:2206)
	at aii.k(SourceFile:479)
	at atj.k(SourceFile:38)
	at awb.k(SourceFile:77)
	at aih.h(SourceFile:2051)
	at aii.h(SourceFile:293)
	at atj.h(SourceFile:50)
	at vd.a(SourceFile:581)
	at vd$$Lambda$2694/718614230.accept(Unknown Source)
	at bgf.a(SourceFile:668)
	at vd.a(SourceFile:384)
	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 awb$b.e(SourceFile:267)
	at ann.e(SourceFile:55)
	at alz$$Lambda$2877/1012588104.accept(Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at alz.a(SourceFile:80)
	at aii.cX(SourceFile:615)
	at aih.k(SourceFile:2206)
	at aii.k(SourceFile:479)
	at atj.k(SourceFile:38)
	at awb.k(SourceFile:77)
	at aih.h(SourceFile:2051)
	at aii.h(SourceFile:293)
	at atj.h(SourceFile:50)
	at vd.a(SourceFile:581)
	at vd$$Lambda$2694/718614230.accept(Unknown Source)

-- Entity being ticked --
Details:
	Entity Type: minecraft:pillager (atn)
	Entity ID: 12127
	Entity Name: Pillager
	Entity's Exact location: -230.50, 67.00, -410.50
	Entity's Block location: World: (-231,67,-411), Chunk: (at 9,4,5 in -15,-26; contains blocks -240,0,-416 to -225,255,-401), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at bgf.a(SourceFile:668)
	at vd.a(SourceFile:384)

-- Affected level --
Details:
	Level name: Le savannah
	All players: 1 total; [ve['LegoRenovate'/213, l='Le savannah', x=-210.32, y=70.68, z=-386.29]]
	Chunk stats: ServerChunkCache: 4000
	Level seed: -7143349062234441637
	Level generator: ID 05 - buffet, ver 0. Features enabled: true
	Level generator options: {biome_source:{options:{biomes:["minecraft:savanna"]},type:"minecraft:fixed"},chunk_generator:{options:{default_fluid:"minecraft:water",default_block:"minecraft:stone"},type:"minecraft:surface"}}
	Level spawn location: World: (2,63,14), Chunk: (at 2,3,14 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: 18365 game time, 4730 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 83418 (now: false), thunder time: 114578 (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: 19w12b
	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: 1280175240 bytes (1220 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['LegoRenovate'/213, l='Le savannah', x=-210.32, y=70.68, z=-386.29]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.