Video demo:
https://www.reddit.com/r/arma/comments/vhwt6n/why_does_the_ai_do_this_i_only_have_cba_and_rhs/

Prefer crew firegeometry removed for all tanks and APCs. It would solve this: https://feedback.bistudio.com/T163706
It should also boost game performance.
Crew fire geometry should also be removed for UGV too. UGV shows crew sticking out if non UAV crew is added.

I use the getout eventhandler to detect when gunner gets out, since I'm not sure when would AI orders the gunner out. Eventually the eventhandler will fire for the gunner, even though they have no reason to get out.

I mentioned hunter, offroad 01 with turrets, I've also seen it happen with marid and slammer.
The command needs to completely stop AI in gunner and commander seats, from getting out, except in vehicle immobilization.

I'm not using any AI mods. The AI groups are given a move waypoint. During combat sometimes the AI orders the gunner to get out for unknown reasons. Only happens on some vanilla vehicles.

In some vehicles like hunter and offroad 01, I noticed turret gunner gets out randomly.

Setting both objectDistanceLimitCoef and viewDistanceLimitCoef to -1 eliminated the issue me. AI combat performance with missiles also improved a lot.

Virtual garage crash was fixed in 2.08.149102 - Hotfix #2. Can be closed now.

Same with PCML.

In T162211#2261852, @Tenshi wrote:

Hello thanks for reporting the issue. Could you upload a Mission or Scenario for the Repro?
This would help a lot, with checking it on our internal version and possible troubleshooting.

Top down mode is missing for infantry AT titan, and NLAW.

In T162211#2261852, @Tenshi wrote:

Hello thanks for reporting the issue. Could you upload a Mission or Scenario for the Repro?
This would help a lot, with checking it on our internal version and possible troubleshooting.

After reassigning the skyfire turret control to the pilot, the AI gunner will use the anti tank missiles a lot more. It's just makes more sense that the pilot controls the skyfire as it has to aim the rockets.