Tried running my Sunbracers+Celestial Fire during the GM the other night... and it was consistently failing to proc on-kill grenades. The ability would kill, and or ignite from scorch stacks, but when it was on-kill FROM Celestial Fire, the bracers wouldn't proc.
To that end, I've been seeing (throughout that same GM) "[i]ignition from solar snap WON'T proc Sunbracers neither[/i]".
I'm not sure if anyone else has seen the latter, but that was new for me! Considering I've been rocking Sunbracers for years now, and the dynamic of [i]"getting Bracers to proc from solar ignition caused by your charged melee"[/i]... has been nothing short of a blessing, because it's been consistent!
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Happened a few times for me too, I read on another post that the scorch may be killing instead of the actual ability. Maybe try incinerator snap?