Here is the crash report: crash-2020-05-23_19.36.03-server.txt

^{And the crash report as just text if the link doesn't work:}

---- Minecraft Crash Report -------- Minecraft Crash Report ----// There are four lights!
Time: 5/23/20 7:16 PMDescription: Feature placement
java.lang.UnsupportedOperationException at com.google.common.collect.ImmutableList.sort(ImmutableList.java:565) at asi.a(SourceFile:43) at asi.b(SourceFile:60) at cot.a(SourceFile:42) at cks.a(SourceFile:22) at cks.a(SourceFile:15) at cja.a(SourceFile:44) at cow.a(SourceFile:82) at csr.a(SourceFile:83) at csr.a(SourceFile:79) at csy.a(SourceFile:75) at bqd.a(SourceFile:560) at bqd$$Lambda$4723/1507539531.accept(Unknown Source) at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at it.unimi.dsi.fastutil.longs.LongIterator$$Lambda$4724/2109211712.accept(Unknown Source) at java.util.PrimitiveIterator$OfLong.forEachRemaining(PrimitiveIterator.java:189) at it.unimi.dsi.fastutil.longs.LongIterator.forEachRemaining(LongIterator.java:53) 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 bqd.a(SourceFile:559) at cga.a(SourceFile:210) at cgc.c(SourceFile:84) at cgc$$Lambda$1658/1558931350.doWork(Unknown Source) at cgc.a(SourceFile:214) at yi.a(SourceFile:569) at yi$$Lambda$3995/1288069860.apply(Unknown Source) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at yi.a(SourceFile:563) at yi$$Lambda$3992/662759287.apply(Unknown Source) at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926) at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) at yk.b(SourceFile:58) at yk$$Lambda$3933/2137496523.run(Unknown Source) at amc.e(SourceFile:94) at amc.a(SourceFile:137) at amc.run(SourceFile:105) at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at com.google.common.collect.ImmutableList.sort(ImmutableList.java:565) at asi.a(SourceFile:43) at asi.b(SourceFile:60) at cot.a(SourceFile:42) at cks.a(SourceFile:22) at cks.a(SourceFile:15) at cja.a(SourceFile:44) at cow.a(SourceFile:82) at csr.a(SourceFile:83) at csr.a(SourceFile:79) at csy.a(SourceFile:75) at bqd.a(SourceFile:560) at bqd$$Lambda$4723/1507539531.accept(Unknown Source) at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at it.unimi.dsi.fastutil.longs.LongIterator$$Lambda$4724/2109211712.accept(Unknown Source) at java.util.PrimitiveIterator$OfLong.forEachRemaining(PrimitiveIterator.java:189) at it.unimi.dsi.fastutil.longs.LongIterator.forEachRemaining(LongIterator.java:53) 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)
– Feature --Details: Id: minecraft:village Description: clq@53ec379aStacktrace: at bqd.a(SourceFile:559)
– Generation --Details: CenterX: 78 CenterZ: 19 Step: SURFACE_STRUCTURES Seed: 8912218236062701961 Biome: minecraft:riverStacktrace: at cga.a(SourceFile:210) at cgc.c(SourceFile:84) at cgc$$Lambda$1658/1558931350.doWork(Unknown Source) at cgc.a(SourceFile:214)
– Chunk to be generated --Details: Location: 78,19 Position hash: 81604378702 Generator: cho@35c5f0c1Stacktrace: at yi.a(SourceFile:569) at yi$$Lambda$3995/1288069860.apply(Unknown Source) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at yi.a(SourceFile:563) at yi$$Lambda$3992/662759287.apply(Unknown Source) at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926) at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) at yk.b(SourceFile:58) at yk$$Lambda$3933/2137496523.run(Unknown Source) at amc.e(SourceFile:94) at amc.a(SourceFile:137) at amc.run(SourceFile:105)
– Affected level --Details: All players: 1 total; [yx['Defcon_12345'/90, l='ServerLevel[Snapshot 2]', x=1041.65, y=67.00, z=301.62]] Chunk stats: ServerChunkCache: 4228 Level dimension: minecraft:overworld Level spawn location: World: (-176,64,21), Chunk: (at 0,4,5 in -11,1; contains blocks -176,0,16 to -161,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511) Level time: 222143 game time, 335731 day time Level name: Snapshot 2 Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false Level weather: Rain time: 121367 (now: false), thunder time: 100018 (now: false) Known server brands: vanilla Level was modded: false Level storage version: 0x04ABD - AnvilStacktrace: at net.minecraft.server.MinecraftServer.b(SourceFile:896) at net.minecraft.server.MinecraftServer.a(SourceFile:832) at enr.a(SourceFile:89) at net.minecraft.server.MinecraftServer.run(SourceFile:691) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 20w21a Minecraft Version ID: 20w21a 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: 1002706040 bytes (956 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB) CPUs: 4 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; [yx['Defcon_12345'/90, l='ServerLevel[Snapshot 2]', x=1041.65, y=67.00, z=301.62]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.