Not true. Devs have previously stated that even if the AIN changes while in queue you will still get the bonus.
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If you enter the DR with a full premade party (all 4 slots are occupied) you also won't get a cluster even if you fulfill all the other requirements.
I just learned a thing. Literally now I understand roulettes much better now >.>' However that raises the question why is it always tank? One would think that healers would be equally if not in more need. I could be wrong of course but I'm always hearing how tanking is easier compared to healing (I personally can't stand it but to each their own)
This one time, this happened.
https://i.imgur.com/nEzzAfI.jpg
I actually got a leveling roulette AIN bonus as DPS once - and this was recently enough that i got a cracked cluster for it. You see it on main scen and guildhest sometimes. Personally never seen on expert or 50/60 but i imagine its possible. The DF system supposedly looks at how many people of each role are qued, and assigns a bonus to the class in need to get things balanced. The system thinks it needs more tanks like 70+% of the time, healers 29+%, and DPS... i guess 0+%. When you ask why healer isnt equal with tank... well you answered that yourself. You cant stand tanking. A lot of people agree.
Refresh your roulette menu immediately before pushing register is all I can suggest, I'm guessing when the bonus occasionally changes the menu doesn't update during those few seconds between when you're reading the bonus and when you hit that register button.