Ploughs will break any box without a collision box, except those in a very hardcoded instanceof list.
This includes ghost or ephemeral blocks added by some mods which have no collision box but appear as a more solid block (typically glass or in the case of copycats+, whatever you happen to click onto it)
This is not ideal as it requires mod authors to use mixins if they want to add (or remove) blocks on this blacklist.

A better solution is a block tag, so that anyone (even pack makers) can modify this blacklist and add any sort of block to it without mixins, leading to much better compatibility.