Our guild IW raided Crystalline Ent*ty bioenergy to 0
Before that, EKSoD also started it, but we were faster and later, their raid finished and guess what?
Their raid COUNTED! Heck, they even got item from it.

And no, I am not against EKSoD there, it's just a bug that needs to be fixed.

I agree, that is a bug.

but I was thinking... what should be done? Should all raids against it be cancelled once Bioenergy hits 0? That's the only thing I could come up with =/

It's not as if it would be actually easy to hit that thing or as if it would be 'alive' for to long

So, yeah, if a raid upon a big boss NPC is set up by two guilds and one of it knocks it out cold and the other one launches the raid in 10 minutes after 5 hours and 45 minutes of getting members joined into the raid, why wouldn't 1 extra unit of bioenergy pop up to actually give that second guild a chance, if they already had the raid set up?

What is to say regarding the CE is that after it is hit several times almost at the limit of the 24 hours (18 after last raid's launch time to form the new one and another 6 hours to get members to join), it's KO-ed a lot before the two sentinels cycle reprises.

So maybe what needs to happen is that since CE requires such large amounts of people in raids (compared to previous raids), maybe CE's bioenergy needs to be higher?

I'd personally opt for that -- being given the fact that the first sentinel respawns in 7 days after it was hit, it's possible (it happened 2 times already) to have the Crystalline Ent*ty drop to 0 bioenergy a few good days before the room shuts down and the hitting-the-sentinels cycle restarts.

Since when did this happen!?

It's never happened for me. I tested it a month or so ago.

Perhaps I changed something back then