for some reason, the last two tiers of your belts no longer have miniloaders

Miniloaders isn't my mod.
The author of that mod is the person whom adds the extra tiers if it detects mine, please ask him to look into it.

But you may have changed something in your Last update (I put it here because it stopped working with your last update, not miniloaders'

Although, I'll open a thread on miniloaders too

OK, the thread about this topic is already opened there

The only changes I've made is to fix base game issues. I don't think I should have changed anything that would cause miniloaders to fail to add tiers 4 and 5.