IllegalArgumentException with git plugin 4.5.0 + JCasC

I'm unable to update git-plugin to >=4.5.0, when Jenkins starts up it throws java.lang
.IllegalArgumentException: No jenkins.scm.api.SCMSource implementation found for git (see the full attached stacktrace). I'm using JCasC, though I'm not sure if it's relevant in this context. I've also attached the plugins.yaml; the only relevant part of the jenkins.yaml file pertaining to the git plugin is as such:

gitSCM:
   createAccountBasedOnEmail: false
  showEntireCommitSummaryInChanges: false
   useExistingAccountWithSameEmail: false

I'm not sure why this is occurring, does anyone have an idea?