I'm running PresonusStudio One 5.0.2 in Windows 10.

MPE Controller – Sensel Morph

Pendulate works fine in standard MIDI mode but gives nothing in MPE mode.

My Morph drives other MPE VSTs just fine but not Pendulate.

Is your Morph doing polyphonic pitch bend in the other VSTs?  The Morph can send either MIDI or MPE and some MPE synths will receive MIDI even when their MPE mode is selected, so it's possible you're running MIDI from the Morph rather than MPE?

Dan