We’ve already adjusted logging here to not log when the associated session is anonymous. That’s the trivial “expired session” case. See [JENKINS-40344] Don't log warning for invalid crumb from anon by daniel-beck · Pull Request #3049 · jenkinsci/jenkins · GitHub
This now mostly happens with multiple tabs (some of which have pages loaded under the old session with a now invalid/expired crumb), or when you’re using some sort of bad automation that still assumes that crumbs for specific users never expire.
If we stop logging this, we also no longer help users understand why their old scripts stopped working.