• The outcome in both sets of steps is the same regardless of the player starting in/out of a vehicle. I started outside to better illustrate the issues.
• I ran this test on a 100% vanilla local server to avoid my earlier mistake (see additional info and my comment to Geez below after he pushed for internal testing)

Repro steps Issue 1:

1. Start outside a vehicle with the HUD visible.
2. Disable the HUD using the assigned key binding (default long press tilde).
3. The HUD on both the left/right goes away.
4. Enter the vehicle
5. The Vehicle HUD displays in the left-hand corner (problem)
6. Exit vehicle
7. A partial HUD (stamina bar and noise indicator) is now in lower left corner (problem)
8. The partial HUD will only go away if the tilde is long pressed twice in a row OR if the Esc key is hit twice to open close the options menu.

Repro steps Issue 2:

1. Start outside a vehicle with the HUD visible.
2. Disable the HUD using the Game Options menu (By default, press Esc and go to Options>Game and set "Show HUD" to "Disabled").
3. The HUD on both the left/right goes away.
4. Enter the vehicle
5. The Vehicle HUD displays in the left-hand corner (problem)
6. Exit vehicle
7. A partial HUD (stamina bar and noise indicator) is now in lower left corner (problem) i) The default key binding (long press tilde) has no effect.
8. The partial HUD will only go away if a change is made to options and then applied. i) This can be any game/audio/video/control option as long as Apply is selected and does not have to involve the HUD.

See video for more details.