The setting of MIDI channels for an application change when a new preset is being selected in both standalone and plug-in. The setting should'nt change. This behavior is a bug.
Arturia please fix this in your applications.
EDIT: I can see, that for some applications, then the MIDI channels perhaps need to be preset based, like B3V where you can set seperate MIDI channels for the manuals, and other applications where this is the case. But in generel to me, a Global MIDI channel setting should not change when shifting presets. EDIT END