Take for example two themes that support the video post format. Theme A stores the url of the video in a meta field called “theme_a_video” and Theme B in a meta field called “theme_b_video_url”. If you change from Theme A to Theme B, Theme B doesn’t know that the video urls are stored in the “theme_a_video” meta field.
I had this situation once and I solved it by studying how each theme implemented the post format internally and then creating a SQL query that updated all the past instances in the database to work with the new theme.
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