Game crashes when trying to generate a nether biome superflat world with ruined portals

The following presets crash minecraft (Crash logs attached):

minecraft:bedrock,2*minecraft:dirt,minecraft:netherrack;minecraft:warped_forest;bastion,ruined_portal,fortress
minecraft:bedrock,2*minecraft:dirt,minecraft:netherrack;minecraft:warped_forest;bastion,ruined_portal

Stack trace

20w17a\: [^crash-2020-04-28_20.16.53-server.txt]

Description: Exception generating new chunk

java.lang.NullPointerException: Exception generating new chunk
	at chu.b(SourceFile:21)
	at chu$$Lambda$1177/1489504599.test(Unknown Source)
	at cle.b(SourceFile:226)
	at cle.a(SourceFile:33)
	at cle$a.a(SourceFile:158)
	at cfy.a(SourceFile:206)
	at cgc.d(SourceFile:51)
	at cgc$$Lambda$1273/1297259456.doWork(Unknown Source)
	at cgc.a(SourceFile:214)
	at yd.a(SourceFile:568)
	at yd$$Lambda$3457/988352912.apply(Unknown Source)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at yd.a(SourceFile:562)
	at yd$$Lambda$3454/814546249.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
	at yf.b(SourceFile:58)
	at yf$$Lambda$3400/1443113591.run(Unknown Source)
	at als.e(SourceFile:83)
	at als.a(SourceFile:123)
	at als.run(SourceFile:91)
	at java.util.concurrent.ForkJoinTask$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)