Ace of Spades Firefly doesn't count as a solar explosion and won't work with solar fragments, aspects or bounties. It also has a slightly longer delay on explosion after precision kill.
Fatebringer Firefly for comparison with the same aspect and fragments:
https://youtu.be/R-YC0sqlq2k?si=V2Qfl1zpOaBCJpyS
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Hi there, thank you for your report. We'll pass this along to the developers for investigation.