The game crashed as I break a full block of oak wood slabs causing me to crash.
19w38a\: [^crash-2019-09-18_21.01.43-client.txt]
Description: Tesselating block model
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at cxj.b(SourceFile:91)
at cxe.a(SourceFile:306)
at dps.a(SourceFile:134)
at dps.b(SourceFile:76)
at dps.a(SourceFile:47)
at dpq.a(SourceFile:48)
at dpd.a(SourceFile:1300)
at dpa.a(SourceFile:691)
at dpa.a(SourceFile:535)
at daj.e(SourceFile:931)
at daj.b(SourceFile:564)
at net.minecraft.client.main.Main.main(SourceFile:199)
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It happens to me too, but only on a block that I've placed myself, not on the first (generated) block that I successfully mined up. Seems to be unrelated to the type of block.

it happens to me with all the blocks

Same here

this happend to me aswell it crashed with any block except scaffolding (watterlogged) and shulker boxes (placed before updating to 19w38a) for some reason. ig im going back to 19w37a. Also tried with a texture pack that changes the texture of the breaking texture and still crashed.

I think this might be caused by the block breaking texture (cracks on surface of block), because it never happens to me on blocks that break instantly, such as torches. The game crashed for me when breaking a quartz block with an unenchanted diamond pickaxe, but did not crash when mining quartz blocks with a pickaxe enchanted with efficiency IV (which makes the block break instantly). It also crashed when I was jumping in the air to break a netherrack block, but not when I mined a netherrack block while standing on the ground (both times with an efficiency IV diamond pickaxe). I also tested dirt with an efficiency IV diamond shovel, and the game did not crash, but it did crash when breaking dirt with no tool.
Interestingly though, chests and shulker boxes also do not seem to cause the game to crash, despite the fact that the breaking texture is rendered (albeit incorrectly) while breaking them.

It happen with a lot of blocks
For my par i can break a redstone ore with a diamond pickaxe but every grass/dirt/stone can'ot be broken with a tool or an empty hand
I have see a strange stray when i have break a redstone block, i will try to reproduce it
edit : in a chunk i can break redstone ore but when i go in an other, it's not possible

Happen to me only breaking block without right tool
But breaking texture is right viewed

I just reported this as well. Trying to break any tree causes a crash.

This issue has just been fixed in the second snapshot of this week 19w38b.

Seems Like MC-47427