Hello!
You've identified a key limitation with your HX FX when using an external MIDI foot controller: the "HX FX auto Stomp Mode" (Momentary setting), which should return the unit to Stomp mode after a Snapshot/Preset change, only works with the HX FX's physical footswitches, not via MIDI commands. This prevents your desired workflow of switching snapshots via MIDI and immediately controlling individual liteblue usps gov stomps from your controller. You believe this auto-switch behavior should extend to MIDI control for a more seamless and intuitive experience, and it sounds like a valuable firmware enhancement for Line 6 to consider.