Hi Anthonie,
I could have written your description of the issue. Mine is identical in every way.
Following the submission of my ticket to the Steinberg support, I was able to get in contact with its senior representative, who assured me that (quote) “the task is queued for resolution within the next version”. (end of quote). “Next version” is here to be understood as Cubase 13, or Cubase X (where X stands for the next product version following Cubase 12). He was not allowed to give me more precision about the availability date.
Anyway, he confirmed that his team managed to reproduce the issue on their own within a minimalistic sample test project and is working on a fix, which, despite the lack of more concrete information about a release date, sounds pretty positive in my opinion.
I hope this will come soon though as this issue is especially disabling…