We have recently upgraded to the standard version, primarily for mirror cards.
When I am creating mirrors I often create it directly to a different board. All the boards are in the same workspace so they are all paid boards. Some of the Mirrors work and some don't and I don't know why.
I am primarily using the windows desktop version but it is doing it with the browser version as well. We have not moved to Windows 11. Don't know if that would make a difference.
At first if I went into task manager and ended the process then restarted they would usually show up as mirrors. This doesn't seem to be working anymore.