Outlook Calendar issue in latest Edge version within Windows 11

I open Outlook in Edge

Go to Calendar

Open a day to enter a new appointment.

Up comes the appt window, but it's blank. And it stays blank.

Do it again = Same result

So I got to latest Firefox and do the same, and the new appt screen works properly.

That's it.

It doesn't work in Edge, except it can, for a bit, but it becomes unstable. Then it's back to blank again.

Is this a known bug?

Regards

David