the HMD deadzones in the cockpits of almost every aircraft that has an HMD do not appear in the correct angles and mostly appear directly on the aircraft’s 3/9 line in stead of every spot where there isn’t a HUD.
the aircraft i found that do not have this issue are the US F-16C-50, Mirage 2000D-RMV, Kfir C.10 and the Eurofighters.
i’ve provided the JAS39C and Mirage 2000D-RMV below as example for what the deadzones look like on most aircraft (gripen) and what they should be (mirage)