Doors should be recessed. If they are not you are fully reliant on the cavity tray as they are out in/on the wet outer leaf. This can work but depends on good workmanship.
The issue here is that flush glazing/ brick means water pours down the outside, across the face of the glass.
Have known of a few cases of water run off from brick / render salts etching the glass if left on (particularly depending on glass surface coatings)
Needs a small aluminium drip flashing above to displace the water away from the glazing. Any leak into the door head after would mean an issue with cavity tray.