Creating a superflat world with nothing but air crashes the game

The bug

When creating a superflat world with nothing but air in as the present, the game will crash when you click the "Done" button.

How to reproduce

1*minecraft:air;127;decoration

Crash report

1.16.2\: [^crash-2020-08-20_16.04.11-client.txt]

Description: mouseClicked event handler

java.lang.IllegalStateException: Missing: ResourceKey[minecraft:worldgen/biome / minecraft:127]
	at gm.d(SourceFile:378)
	at don.b(SourceFile:276)
	at don$$Lambda$3396/1581005885.get(Unknown Source)
	at cpc.e(SourceFile:188)
	at cpc.c(SourceFile:131)
	at chi.<init>(SourceFile:26)
	at dsd.a(SourceFile:105)
	at dsd$$Lambda$3360/914254500.accept(Unknown Source)
	at dns.b(SourceFile:88)
	at dns$$Lambda$3363/975316968.onPress(Unknown Source)
	at dlg.b(SourceFile:33)
	at dla.a(SourceFile:16)
	at dle.a(SourceFile:149)
	at dme.a(SourceFile:27)
	at djx.b(SourceFile:92)
	at djx$$Lambda$3035/1337289695.run(Unknown Source)
	at doq.a(SourceFile:435)
	at djx.a(SourceFile:92)
	at djx.c(SourceFile:162)
	at djx$$Lambda$3034/618698910.run(Unknown Source)
	at any.execute(SourceFile:94)
	at djx.b(SourceFile:162)
	at djx$$Lambda$2386/130839597.invoke(Unknown Source)
	at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
	at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
	at djw.e(SourceFile:1046)
	at djw.e(SourceFile:656)
	at net.minecraft.client.main.Main.main(SourceFile:215)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
	at gm.d(SourceFile:378)
	at don.b(SourceFile:276)
	at don$$Lambda$3396/1581005885.get(Unknown Source)
	at cpc.e(SourceFile:188)
	at cpc.c(SourceFile:131)
	at chi.<init>(SourceFile:26)
	at dsd.a(SourceFile:105)
	at dsd$$Lambda$3360/914254500.accept(Unknown Source)
	at dns.b(SourceFile:88)
	at dns$$Lambda$3363/975316968.onPress(Unknown Source)
	at dlg.b(SourceFile:33)
	at dla.a(SourceFile:16)
	at dle.a(SourceFile:149)
	at dme.a(SourceFile:27)
	at djx.b(SourceFile:92)
	at djx$$Lambda$3035/1337289695.run(Unknown Source)

-- Affected screen --
Details:
	Screen name: dns
Stacktrace:
	at doq.a(SourceFile:435)
	at djx.a(SourceFile:92)
	at djx.c(SourceFile:162)
	at djx$$Lambda$3034/618698910.run(Unknown Source)
	at any.execute(SourceFile:94)
	at djx.b(SourceFile:162)
	at djx$$Lambda$2386/130839597.invoke(Unknown Source)
	at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
	at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
	at djw.e(SourceFile:1046)
	at djw.e(SourceFile:656)
	at net.minecraft.client.main.Main.main(SourceFile:215)