Pilots must insist that they only fly once myocarditis is excluded e.g. tests such as D-dimer, high-sensitivity troponin, contrast chest MRI, EKG etc. A vaccine-induced myocarditis heart with scarring (scarred myocardium), under stress e.g. emergency situation or stressful situation in the cabin/cockpit, will result in adrenaline flooding the system, and this can be too much stress for the already scarred heart and there could be irregular heart activity (e.g. arrythmia), then possibly cardiac arrest/death.
Refuse to fly unless you are cleared.