I'd play that safe if hitting it with a full streak running, though I do know from experience that if you're outside of the level range, or group is, for streak maintenance then it doesn't matter. I have repeated this a number of times hence my elite streak is only up to around 76 by level 14.
Just as an update to this thread:
The Cove event does not break the BB streak.
Tested only at two levels over character level, I don't know if this is relevant or not.
I was lvl 4, on a hard difficulty streak and my chain was _not_ broken. The score card told me it would be broken, but thankfully it didn't.
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