It seems there is no integration with the MK3 for the Minifreak V plugin. In the MIDI options dropdown, there is no option for MK3. Therefore, nothing shows up on the Arturia screen, and of course the MIDI mapping isn’t as robust.
the support for MK3 for all the other instruments was part of an Aug 22-27 update. but it looks like the MiniFreak was missed totally. Either they are making some serious changes to this instrument or the update just got overlooked.
You might want to shoot a support request to arturia to bring it to their direct attention as this doesn’t sound like a feature request, but more a functionality bug that they missed. but that is just my opinion.