walls of any kind break with fist instantly

place a wall, punch it

usual block-breaking mechanic

no log

CodeChickenLib-1.12.2-3.2.3.358
ForgeMultipart-1.12.2-2.6.2.83
MrTJPCore-1.12.2-2.1.4.43
ProjectRed-1.12.2-4.9.4.120

Confirmed. Will look into it.

The problem is still present, walls are destroyed by a hand or a block without an object falling out, but if you hit with a pickaxe, an object falls out.

Fixed on 1.15 branch: 05d7358