A few hours ago, I entered the quest "Old Grey Garl" (level 7) on Normal with a level 7 character (name: bellcranel; server: Cannith) and an elite bravery streak of 16.
I realized that this might break the streak (but didn't remember the specifics, because I haven't played much recently), so I opened the xp log and saw the message informing me that "you are not eligible for Bravery Bonuses in this quest, but will not disrupt Bravery Streaks." Confident in my ability to hold my unusually high streak, I continued the quest and forgot about the streak.
When I went to enter another quest some time later, however, I notice that both of my bravery streaks had reset to zero. This is fairly annoying, in part because it's very rare for me to have much of a streak (and because the streak had helped make that character my fastest-leveling one to date), but more because the game had informed me that my streak would not be broken.
I realize it's unlikely that I can get the bonus reinstated besides by re-earning it (which won't be easy lacking the ability to open quests on higher difficulties), but I feel it's always worth a try, and I wasn't sure if this warranted a proper bug report.
I also have a couple screenshots, if those would help.