keine Ahnung...
ich habe ein paar Infos gefunden:
es scheint insgesamt ein bekanntes Phänomen zu sein, welches auch bei anderen Impfungen, z.B. Grippeimpfungen auftritt.
https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2779389
Isolated facial paralysis after vaccination has been reported as case reports for decades with almost all viral vaccines, and it is thought to be immune mediated or induced by viral reactivations (eg, reactivation of a herpes virus infection) ....
...
To conclude, if an association between facial paralysis and mRNA COVID-19 vaccines exists, the risk is likely very low, as with other viral vaccines
aber warum das passiert, scheint noch ungeklärt zu sein.