Branches of large jungle trees (2 × 2) replace any block

The bug

Branches of large jungle trees (2 × 2) can replace any block and not just the normal replaceable blocks like leaves or vines.

How to reproduce

1. Use the following commands while remaining at the same position

   /fill ~1 ~ ~1 ~8 ~25 ~8 glass hollow
   /fill ~1 ~25 ~1 ~8 ~25 ~8 air
   /fill ~4 ~ ~4 ~5 ~ ~5 grass
   /fill ~4 ~1 ~4 ~5 ~1 ~5 jungle_sapling
   /gamerule randomTickSpeed 1000
   

2. Move around the glass box
   → Some of the branches replaced glass

Note: This might require multiple tries

Code analysis

Based on 1.12 decompiled using MCP 9.40 PRE 1

The branches generation in the method net.minecraft.world.gen.feature.WorldGenMegaJungle.generate(World, Random, BlockPos) does not call the method net.minecraft.world.gen.feature.WorldGenAbstractTree.canGrowInto(Block) to test if the log blocks can be placed.