Bookmarks can relate to regular audio tracks or podcasts.
But the references are not adapted in bookmarks.dat, neither for regular audio tracks nor for podcast files:
* when using File -> Library -> Relink Music File Paths...
* when using Preferences -> tab 'Library' -> section 'podcasts' -> 'naming template' -> button 'Reorganise...'
As a result, bookmarks become unusable for files that have been moved.
And since bookmarks.dat isn't plain text, it isn't editable, so there's no workaround.
I suggest that, when the two features mentioned above perform path replacements in the library / playlists / Subscriptions.dat,
they carry out the replacements in bookmarks.dat in the same stride.
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Related topics in 'Questions':
https://getmusicbee.com/forum/index.php?topic=40410.0https://getmusicbee.com/forum/index.php?topic=40429.0