It's a huge exploit that ruins PvP for a lot. It's harming those trying hard to get NF, recluse and so on. If you can't fix it (been in the game for a while) then why not just remove countdown early before shadow keep. Most of the community don't enjoy countdown anyway, hence it being removed in shadow keep ....
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I joined a team on the Destiny LFG for comp the other day (xb1), map was ER/Countdown and I think somebody on my team did this glitch (one round only). I called one of them out on it straight away and said i'll leave if it happens again and it just went completely silent in the chat. It's just not cool, I hate cheating and I hate the thought of my account being under risk because I joined someones fire team who did it without warning so I could have perhaps left before it happened.