I have a component: an ATmega328PB microcontroller. It has 32 pins, plus a back pad (33rd pin). My footprint has 33 pads (extra pad for back pad (thermal)). My schematic symbol also has 33 pins, mapped to the corresponding pads (1 thru 33).
For some reason, if I connect pin 33 to a net in the schematic, that connection does not get translated to the PCB. If I select the pad in the PCB editor and open it's properties dialogue, I can manually assign a net to that pad, which is a workaround I suppose. If I subsequently connect a different net to this pad, the same behaviour persists (i.e. if I manually set that pad to be connected to GND and then in the schematic I connect +5V to pin 33, if I go to import that change into the PCB file, CircuitStudio says that there are no changes to import. 
See video to see what I mean (below).
e14softwareuk --> what could be the cause of such strange behaviour?
