Last night my burster had a max targets of 7, today after the patch the max target is 3... this is with both Vac Pack +3 and Targeting Slot +2 installed.
according to the link below this was a previous issue.
https://news.ubisoft.com/en-us/artic...l-changes-7-10
Firefly:
Decreased Blinder Firefly base blind duration from 8s to 6s.
Increased Burster Firefly base damage by 6.7%.
Vac Pack and Guiding System Firefly mods now correctly increase Max Targets by the amount listed on the tooltip.