Destroyed Engines and watery graves

[Iceweb]

Playing in 45.4 had a hover that was over water so I shot at it.  Got this in the fire phase: 

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Weapons fire for Orion ON1-K (Ulric's Behemoths)
    AC/10 at Condor Heavy Hover Tank (Standard) #2 (Draconis Combine); needs 7, rolls 8 : hits  (using Left Side table) LS (critical)
        Condor Heavy Hover Tank (Standard) #2 (Draconis Combine) takes 10 damage to LS (critical).
            Armor destroyed.
             3 Internal Structure remaining.
            Critical hit on LS. Roll is 5; no effect.
            Critical hit on LS. Roll is 9; Engine destroyed.  Immobile.


    Medium Laser at Condor Heavy Hover Tank (Standard) #2 (Draconis Combine); needs 7, rolls 7 :  - Glancing Blow - hits  (using Left Side table) FR
        Condor Heavy Hover Tank (Standard) #2 (Draconis Combine) takes 2 damage to FR.
            20 Armor remaining.
            Chance for motive system damage. Roll is 16; (w/ +5 bonus)
             Major damage, vehicle immobile.
*** Condor Heavy Hover Tank (Standard) #2 (Draconis Combine) DESTROYED by a watery grave! ***
 

As you can see the AC gets a standard crit and blows the engine which immobilizes the hover but it is not destroyed by the water hex.  Next the laser gets a motive crit causing the craft to drown. 

Looks like a line to check prohibited terrain when an engine blows is missing.  I'm figuring this was a known issue but I don't remember seeing it before. 

Can you tell me if this one is known about, or if I should open it on the bug tracker?

[Gigastrike]

My guess is it's waiting to check for that until after all weapons fired.  After all, mechs don't fall over until after the firing phase.