Project just a few tracks, but both have Izotope Nectar. Opened first project, decided I needed to get the plugin setup from an earlier similar project, when to open that project, yes to Activate the project, cursor just spun.
I saved a crash dump file from within the Task manager. It is too large to upload.
This is Windows 10 Pro, latest SP. Cubase 12.0.30.
I see this has been reported before but I wanted to indicate that it is still an issue in C12.