[0.12.26] Ability to melee target from infinite(?) range after running out of ammo

I apologize if I've missed this being reported somewhere, but it's a strange bug so I didn't see it using various search terms.
I'm able to melee and damage an enemy unit or structure from infinite (or at least ...

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This was like my 2nd attempt at finding a good map; I guess I got lucky.
There are all resources on the spawn ...