Crash upon load: "Unable to fit minecraft:blocks/lava_flow"

The issue

I tried playing on the new snapshot for the first time, but immediately got a crash. There was nothing out of the ordinary. The crash report said this:

cjr: Unable to fit: minecraft:blocks/lava_flow - size: 32x32 - Maybe try a lowerresolution resourcepack?
I tried equipping all resource pack except vanilla in the options.txt file, that didn't have any effect. I checked the default resource pack, and the lava_flow.png file has a size of 32x512px. I have never had this problem before, and I can't figure out the problem.

Crash report

18w03b\: [^crash-2018-01-19_17.27.35-client.txt]

Description: Initializing game

cjr: Unable to fit: minecraft:blocks/lava_flow - size: 32x32 - Maybe try a lowerresolution resourcepack?
	at cjq.c(SourceFile:58)
	at cjs.b(SourceFile:109)
	at cjs.a(SourceFile:53)
	at cli.n(SourceFile:690)
	at cli.a(SourceFile:183)
	at clj.a(SourceFile:23)
	at tf.a(SourceFile:119)
	at bob.an(SourceFile:496)
	at bob.a(SourceFile:367)
	at net.minecraft.client.main.Main.main(SourceFile:140)