Yes the space bar is currently a known issue that is being addressed, but it shouldn’t actually be a problem for you, you don’t need to use space with metric input.
Start drawing your rectangle, drop the mouse and type 9920mm,5000mm and hit return.
I take that back, the mm is causing issues. If you are working in mm you can just type 9200,5000 and it should work. Or if the model units are meters type it as 9.2,5
Actually, it seems to be more than just the spacebar. The evidence suggests that the code that parses your input for measurements is breaking and interpreting anything non-numeric as a shortcut key instead of units.