I triggered it again by opening a second project after closing a previous one WITHOUT CLOSING CUBASE.
As GPnicolett discovered before.
It doesn’t seem to happen when trying it with empty projects.
I closed a big project without closing Cubase and opened a second big project and this is the second or third time I triggered it like this. In between when I just force quit Cubase and restart it when opening another project (99% of the time I do that) I didn’t have the bug ever in the last time.