Confirmed in arma vanilla.
I placed a Mora at Stratis: [2594.48,5482.89,-0.0391083] (copied from 3den)
Then shot with B_soldier_AT_F player (missile on visual target). The destroyed mora flies high into the air.

I have also tried this and can confirm that this also happens on the latest main patch.

Bug still exists in the latest version

I believe this was introduced with Contact. My impression is that the cause is the physics hitbox of the wreck model being extended well below the visual model and clipping into the ground - you can also find the wrecks appearing to float in some circumstances.

In T155018#2235848, @NikkoJT wrote:

I believe this was introduced with Contact. My impression is that the cause is the physics hitbox of the wreck model being extended well below the visual model and clipping into the ground - you can also find the wrecks appearing to float in some circumstances.

Yes i also think that this is the Problem. Doesn't look extremly hard to fix. I get the impression barely anyone uses vanilla assets because nobody reports about this bug.

Thank you for reporting the issue.
I was able to confirm the problem on our internal version.
We will see what we can do.