I found that if I use the file-view (Internal Storage, External Storage, Music on External Storage) instead of the library-oriented options like "Album Artist / Album" to add music to a playlist, these files are scanned for information only sufficient to get them to play. During play, foobar2000 will not detect the tags or necessary seeking information to seek on the track.

I've only tested with Ogg Vorbis and FLAC on my Android foobar2000 mobile.