Tried to generate a new world, the game just froze and didn't even respond to attempts of force-closing it. Had to kill its process in the task manager. I found the attached crash report in the Minecraft folder.
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Not a dublicate? Interesting ...
Compared to MC-130427, the game actually made a crash report, but I needed the windows task manager to get out of it. Not really the stability I would expect from a pre-release.

crash here
Minecraft Crash Report -------- Minecraft Crash Report ----// Ouch. That hurt 😞
Time: 6/26/18 3:42 PMDescription: Writing into PalettedContainer from multiple threads
java.lang.IllegalStateException at brl.b(SourceFile:51) at brl.a(SourceFile:118) at brf.a(SourceFile:68) at brm.a(SourceFile:167) at tc.a(SourceFile:225) at bvz.a(SourceFile:133) at bvz.a(SourceFile:42) at bvz.a(SourceFile:14) at bzt.a(SourceFile:21) at bzt.a(SourceFile:14) at bti.a(SourceFile:27) at bct.a(SourceFile:515) at bqu.a(SourceFile:109) at tl.a(SourceFile:12) at tk.a(SourceFile:35) at bqy.a(SourceFile:95) at tr.a(SourceFile:62) at tr.a(SourceFile:25) at ahb$a.a(SourceFile:130) at ahb$a$$Lambda$1501/653897404.apply(Unknown Source) at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902) at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at brl.b(SourceFile:51)
– Thread dumps --Details: Thread dumps: WorldGen-Worker-25: java.lang.Thread.getStackTrace(Thread.java:1552) brl.a(SourceFile:49) brl$$Lambda$1552/380309590.apply(Unknown Source) java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:741) java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) brl.b(SourceFile:50) brl.a(SourceFile:118) brf.a(SourceFile:68) brm.a(SourceFile:167) tc.a(SourceFile:225) bvz.a(SourceFile:133) bvz.a(SourceFile:42) bvz.a(SourceFile:14) bzt.a(SourceFile:21) bzt.a(SourceFile:14) bti.a(SourceFile:27) bct.a(SourceFile:515) bqu.a(SourceFile:109) tl.a(SourceFile:12) tk.a(SourceFile:35) bqy.a(SourceFile:95) tr.a(SourceFile:62) tr.a(SourceFile:25) ahb$a.a(SourceFile:130) ahb$a$$Lambda$1501/653897404.apply(Unknown Source) java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501) java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902) java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689) java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644) java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)WorldGen-Worker-25: java.lang.Thread.getStackTrace(Thread.java:1552) brl.a(SourceFile:49) brl$$Lambda$1552/380309590.apply(Unknown Source) java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:741) java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) brl.b(SourceFile:50) brl.a(SourceFile:118) brf.a(SourceFile:68) brm.a(SourceFile:167) tc.a(SourceFile:225) bvz.a(SourceFile:133) bvz.a(SourceFile:42) bvz.a(SourceFile:14) bzt.a(SourceFile:21) bzt.a(SourceFile:14) bti.a(SourceFile:27) bct.a(SourceFile:515) bqu.a(SourceFile:109) tl.a(SourceFile:12) tk.a(SourceFile:35) bqy.a(SourceFile:95) tr.a(SourceFile:62) tr.a(SourceFile:25) ahb$a.a(SourceFile:130) ahb$a$$Lambda$1501/653897404.apply(Unknown Source) java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501) java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902) java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689) java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644) java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)Stacktrace: at brl.b(SourceFile:51) at brl.a(SourceFile:118) at brf.a(SourceFile:68) at brm.a(SourceFile:167) at tc.a(SourceFile:225) at bvz.a(SourceFile:133) at bvz.a(SourceFile:42) at bvz.a(SourceFile:14) at bzt.a(SourceFile:21) at bzt.a(SourceFile:14) at bti.a(SourceFile:27) at bct.a(SourceFile:515) at bqu.a(SourceFile:109) at tl.a(SourceFile:12) at tk.a(SourceFile:35) at bqy.a(SourceFile:95) at tr.a(SourceFile:62) at tr.a(SourceFile:25) at ahb$a.a(SourceFile:130) at ahb$a$$Lambda$1501/653897404.apply(Unknown Source) at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902) at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
– System Details --Details: Minecraft Version: 1.13-pre4 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_25, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 224292840 bytes (213 MB) / 503316480 bytes (480 MB) up to 1073741824 bytes (1024 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M Profiler Position: N/A (disabled) 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.

Tried several more attempts to generate new worlds, the game crashes consistently. Not being able to make a new world is a serious and literally game-breaking problem!

This sucks

ah, looks like MC-132073, so a few people DID notice this ... good

Duplicate of MC-132073.
Please use the search function next time.

@unknown Your comment is uncalled-for considering I already noted MC-132073 right above it and did use the (not always so perfect) search function. Please read previous comments before commenting after a comment ...