[Vanilla Bug] Explosion_Damage deals damage at ground level regardless of explosion Z coordinate

[Rampastring]

First Check

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Description

Now that Vinifera has rockets, this issue is particularly important, as this bug often makes rocket interception pointless.

Warheads that are detonated mid-air (like rockets that are shot down, or even just SAM missiles hitting flying aircraft) also cause damage to objects on the ground, regardless of the height level that the explosion happens at.

Required Code (optional)

No response

Steps To Reproduce

Have a high-flying rocket target a building that is protected by anti-air coverage.

Expected Behaviour

The rocket is shot down as it descends on the building, dealing no damage.

Actual Behaviour

If the rocket has reached a cell of the targeted building so that it is above the building while shot down, the building receives damage regardless of the rocket's flight level.

Additional Context

This can also be reproduced by simply telling aircraft to force-move on top of an enemy building in Tiberian Sun. As enemy anti-air defenses fire at your aircraft (that are on top of the enemy building), the building also receives damage.