jenkins git-scm woes

New problem with Jenkins freestyle jobs, of which we have a few, after upgrading to this week's newest core (2.269) and plugins (git-4.4.6 in particular). While pipeline jobs work, the freestyle ones insist that the "Source Code Management" is "None" despite having the tag in config.xml on disk.

This happens both in Web-UI (where I first assumed this is related to divs-vs-tables migration since that UI is pretty broken at the moment), but also happens when a job config is saved - the tag is lost and replaced by nullSCM (Job Config history reverting to an older config, Extensible Arguments saving a new option value, etc.), and during run-time parsing of the job to actually run it - git is not called, and jobs fail with no code to build.