Not particularly surprising given that the workers in question already have severe enough allergies to something else - enough to carry an epipen. In my opinion, it's pretty bold of these guys to get first in line considering they're already atopic. That's an individual decision.
An mRNA vaccine which stimulates an immune response goes a bit overboard in people known to have an overactive immune reaction to other allergens? Meh. The thing that annoys me is that this will be blown out of proportion by anti-vaxxers etc.