Invincible Skybridge Bug

So not sure how this happened but I just got done with a game where we lost primarily because blue's major structure (their skybridge across the whole map) was indestructible - I went ALL the way to their home base to kill that support to my surprise none of it fell.

Noticing that the center was being held up on a mountain, I manage to FINALLY get there after many many attempts. Unfortuantly, their entire skybridge apparently had "spawn protection" - in that nothing could destroy the last supporting block.

Now we used to control the mountain where this major skybridge support was- I'm wondering if somehow our ladders got confused as beloning to them, and somehow the enitre skybridge had spawned with spawn protection?

Fairly annoying bug because I was about to completely destroy their entire offense (they had outposts on top) but because the game (or Zeus's favor) decided to make their entire bridge immune to collapse there wasn't any way to stop tthem...