Rekordbox doesn't read or save to that field. https://forums.pioneerdj.com/hc/en-us/articles/205021569-rekordbox-metadata
The BPM (and grid, cues, loops) info are saved in your Rekordbox database.
A response in 2017 regarding this: https://forums.pioneerdj.com/hc/en-us/community/posts/204453843/comments/115000377666
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