Heat mk2 - No program change via USB when using Overbridge

Hello,
When Overbridge is enabled, my Analog Heat mk2 stops responding to program changes. I am sending the PCs via USB. If I disable Overbridge, the Heat receives the PCs just fine.

Is this expected behaviour?
I’ve not tried sending my PCs separately via a MIDI cable yet, but that’s a bit clunky and you’d hope you can do this all via the plugin.

I’ve extensively searched the forums and perused the manuals but cannot find an answer.

Thank you!