M4A / MP4 files use XMP tags instead of ID3 tags, maybe that's Rekordbox's excuse for not writing to the Key tag. But then it does write to all the other tags, so I also find it strange. I just use a different tag editor (kid3) to manually add the KEY (all caps) tag to my M4A / MP4 files, which Rekordbox will then happily read when using Reload Tag.
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