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Fluorine is not only extremely toxic; it is a super-oxidizer that reacts, usually violently, with almost everything except nitrogen, the lighter noble gases [that is, Helium and Neon], and substances that have already been fluorinated. (Braeunig, Robert A. "Basics of Space Flight: Rocket Propellants.") This "everything" includes drone mechanics, chemists, crewmen, ...
Any hint of moisture and you get HF ...
https://www.youtube.com/watch?v=vtWp45Eewtw&t=0s
https://www.youtube.com/watch?v=_wLk2j7_KB0
Also:
https://blogs.sciencemag.org/pipeline/archives/2010/02/23/things_i_wont_work_with_dioxygen_difluoride
https://www.sciencedirect.com/science/article/abs/pii/S0022113900803413?via%3Dihub