Do you have a spare SD card to try a clean RetroPie 3 beta 2 image?
Then you could make sure it is wholly standard and it’ll be easier to debug one step at a time?
i.e. first step is to literally change
to be a key your ipac sends (As well as add in your main ipac settings to the keyboard section
then we can see exactly whats going on.
Or just try remapping your ipac to not use any of
keys, as I’ve seen this could cause some issues before.