Sitecore 10 - Quick fix - Detected that item /Content - in the destination should be moved to XX but /XX was not a path included in any serialized subtree being synced.

While working on Sitecore 10 - You will see this error, it's common because if someone will change the location of the template or content still you may have that serialization file on your local.

the quick fix is the cleanup of your working branch and that will remove all untracked files or changes and do the ser push.