Added this mod recently, only noticed this after I added it.

Crafting at the front of the queue is cancelled when using shift-r, which is the backwards rotation keybind for buildings. I searched control settings, couldn't find anything obvious on this.

That's very strange. I wasn't able to reproduce the error. I looked through the code (haven't looked at it in a while) and there's nothing that would cause this problem. Likely you have another mod that doesn't interact nicely with this one. Maybe another modder used shift-r to reset globals for debugging reasons.

Do you get a message that the queueing mode was set to default or does it just happen without a message?

I can change queuing mode normally with the alt-q, so that's fine.

No message about changes there. I'll look at my other recent mods.

Does shift-r cause the queueing mode to change or does it cause an in-progress craft to be cancelled?

In-progress craft. It seems to cancel one of the currently being crafted item.

Hang on... actually looking at it, it moves the current group of items to the back of the queue.