Game crashes while creating a superflat world with biome_1 tag and Classic Flat

Game freezes during the loading world, when creating a superflat world with biome_1 tag and Classic Flat.

When the dirt is > 35 will not freeze.

minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block;1;village,biome_1

Game output:

Encountered an unexpected exception
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.ClassCastException: axc cannot be cast to azb
	at net.minecraft.server.MinecraftServer.i_(SourceFile:395)
	at cvl.a(SourceFile:115)
	at cvl.d(SourceFile:131)
	at net.minecraft.server.MinecraftServer.run(SourceFile:503)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.concurrent.ExecutionException: java.lang.ClassCastException: axc cannot be cast to azb
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2272)
	at net.minecraft.server.MinecraftServer.i_(SourceFile:393)
	... 4 more
Caused by: java.lang.ClassCastException: axc cannot be cast to azb
	at sf.f(SourceFile:169)
	at bpl.a(SourceFile:221)
	at bpl.b(SourceFile:175)
	at bpl.a(SourceFile:171)
	at boo.a(SourceFile:63)
	at bpa.a(SourceFile:57)
	at bly.a(SourceFile:92)
	at bny.a(SourceFile:16)
	at bny.a(SourceFile:13)
	at bit.a(SourceFile:27)
	at aud.a(SourceFile:416)
	at bhz.b(SourceFile:142)
	at sn.a(SourceFile:13)
	at sm.a(SourceFile:34)
	at bgq.a(SourceFile:89)
	at sr.a(SourceFile:54)
	at sr.a(SourceFile:23)
	at zo$a.a(SourceFile:143)
	at zo$a$$Lambda$876/1296459402.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$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)