I have a fix for this now, but for the time being:
Next time you face this, try de-toggling Blazing Aura and give it 12 seconds (exactly, or more) and reactivate it. The proc gets granted every time you zone, within 10 seconds of zoning. If Blazing Aura is running already, the proc wont trigger until its deactivated and re-activated. There is also an additional issue with timing even if it applies, so that might not fix the issue, but might alleviate it.
Ideally: zone into missi