Hmmm... I think I'd need to know the exact config changes, and perhaps also a modlist.. specifically if you have any of bobs mods, angels mods, or similar mods that might affect the base versions of mini-machines.
I tried loading just mini machines v3.2.0 and Factorio v0.14.22 with the config set to disable balance changes, and I got the desired effect of mini machines having no balance tweaks. That is definitely a weird error; usually Factorio will say that an entity or an item doesn't exist, not just a field. Furthermore, I don't define or reference a field called "mini-machines-2" anywhere in my code, especially not at line 135 of data-updates.lua.
But as far as I can tell, it's working just fine.. It has to be some other mod or perhaps combination of mods that's doing weird things. So modlist?