The previous behaviour was mixing in our cloud tags with local tags, and using those images.
The issue with this was that it was also adding actors to the list that weren’t from the embedded tags which most people using embedded tags would find to be undesirable behaviour.
The “Prefer local metadata” will now use only the things passed in from the local file.
You may want to throw your vote into a feature request that handles the behaviour you want, there is one here for allowing edits to the cast lists: Feature Request: Edit Cast Lists
