Having trouble with multi material support interface on Creator 5 with Orcaslicer

Could someone help me understand what I'm doing wrong when it comes to using multi material interfaces for supports? I'm printing PETG models and want to use PLA, and Orcaslicer does it as such and before sending it to the printer I get the prompt for the IFS to map filaments which I do, but the printer does not use PLA for supports.

I am using the stock profile built into Orca for my C5 Pro. I ran a simple test of printing 3 small cubes and they all printed with the selected filament types, so the printer is selecting the correct filaments for whole objects. Thanks for any help