This is from the National Library of Medicine:

Convulsions/seizures may develop after vaccination with the Moderna vaccine. The estimated risk of incidence is 285 events per million person-years from Day 0 to Day 21 after vaccination.1 Refractory status epilepticus has been seldom documented.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9383153/#:~:text=Convulsions%2Fseizures%20may%20develop%20after,to%20Day%2021%20after%20vaccination.&text=Refractory%20status%20epilepticus%20has%20been%20seldom%20documented.