I think this may be more than just a Bloodlust issue.
I fired Gwenpools Chekovs Gun when there were 2 enemies left and 1 was airborne. The grounded character took only 1 bullet of damage, the other 2 I assume went to target the airborne character and missed.
I think it must be tied to the random nature of that damage. I'm not sure if this is just working as intended, the damage is random so can target anyone, invisible, stunned, airborne etc. if it chooses airborne then it misses.