I have a sticky piston with an end rod pushing a stone block, but the stone doesn't break. It just gets pushed as normal. The option is set to true in the config.

Minecraft 1.11.2
Forge 13.20.0.2204
Quark r1.2-73

This is a dupe of #282 (it's the same underlying issue).

Won't close to keep it visible, but any further discussion should go there.