Arturia assured me in November 2022 that they were working on a firmware update to fix this. Yet nothing has happened and it has been about a year and a half since the last firmware release.
In the meantime they've launched a version of the Polybrute with a different paint job. Evidently their management prioritizes marketing over customer support.
I always get the impression their technical support team are sincere in their responses, and they seem to want to help, but where is this new firmware? And why does Arturia never respond to users on their forums?