I placed a belt on the ore, but I have been unable to remove/deconstruct it, as my mouse only targets the ore.

That... shouldn't be happening. I specifically checked for that fix in testing - do you have a mod list? I'll try to reproduce it independently.

I've implemented possible fixes for other outstanding bugs for the next version - just waiting on this to group in with them.

If you can, when reproducing, use ctrl shift e to open the prototype viewer and look up the entity you're unable to target - then tell me its selection_priority. That'll quickly tell me a fair bit about what's going on, since this issue isn't new - it occurred in 1.1 as well.

Of the entities I have tested, the only affected is the transport belt. It has a "selection_priority" of 45. My mod list is:
Base mod: 2.0.76
Elevated Rails: 2.0.76
Quality: 2.0.76
Space Age: 2.0.76
ClaustOrephobic: 2.0.1
Bullet Trails: 0.7.1

I did play with the mod "Belt Immunity With Benefits(0.1.8)" which could be the culprit, but removing this mod did not fix the issue

Weird. Wonder why that's at 45.