Overbridge Plugins + MBP + Monterey + iPad + Sidecar = improperly loaded frame

When I try to start up SideCar with an Elektron Overbridge plugin running SideCar freezes, or disconnects, or otherwise stops working. If it isn’t having a problem, I can get that abnormal behavior dragging the window back and forth between the MBP and iPad. If I run the Overbridge plugin while SideCar is running, I see a rust-colored frame with black cut-outs. It is routing audio, from the device to the host, however.
Is anyone else seeing this behavior, or am I the only person that’s used SideCar while running Overbridge plugins?