[MC-251316] The game crashes when loading chunks that consist of jigsaw blocks

The Bug:

The game crashes when loading chunks that consist of jigsaw blocks.

A crash report regarding this has been attached and can be found below.

Stack Trace:

crash-2022-05-04_18.36.38-client.txt

Description: Unexpected error

aa: Non [a-z0-9_.-] character in namespace of location: ResourceKey[minecraft:worldgen/template_pool / minecraft:empty]
    at zy.<init>(SourceFile:38)
    at zy.<init>(SourceFile:46)
    at csc.a(SourceFile:122)
    at esf.a(SourceFile:1083)
    at java.base/java.util.Optional.ifPresent(Optional.java:178)
    at esf.a(SourceFile:1080)
    at ss.a(SourceFile:49)
    at ss.a(SourceFile:14)
    at sj.a(SourceFile:22)
    at axe.d(SourceFile:157)
    at axi.d(SourceFile:23)
    at axe.x(SourceFile:131)
    at axe.bn(SourceFile:116)
    at edr.f(SourceFile:1076)
    at edr.e(SourceFile:728)
    at net.minecraft.client.main.Main.main(SourceFile:237)

Steps to Reproduce:

Launch an instance of 22w18a.
Place down a jigsaw block and wait a couple of seconds.
Take note as to whether or not the game crashes.

Observed Behavior:

The game crashes.

Expected Behavior:

The game would not crash.