External MPE control - glitchy pitch bends when multiple instances of a note is played at once

I’m using a Linnstrument to control the PB12 and for the most part it handles incoming MPE expression well, however I noticed that when I play the same note value simultaneously from adjacent rows, the sound sputters when I slide either finger, like the stream of pitch bend values from both notes are being merged. Every other MPE synth I’ve used (OB6, Murmux, Kijimi) handles this fine. Is there a setting I’m missing that enables stacked note bends in MPE? If not, is there any chance of a bugfix? It’s a fairly standard use case for isometric controllers like Linnstrument, Ableton Push, Geoshred and the like. Think: drone-and-melody arrangements, guitar style bending of the same note on different strings, doubling a part in real-time, etc.