I’m French but… there isn’t a comma, is there? “Fixes” is the main noun, “bug” qualifies the noun. “Fixes of bugs” or “bugfixes” like “weekday” or “storm trooper”. Whether there is a space or not depends on lexicalization, ie whether it feels like one concept. Bugfix is a single concept but “snow patrol” is two; and modern compounds tend to be two separate words, so “bugfix” is only joined in technical environments, maybe not for the broader audience.