Attention BandLab staff -
FLAC files generated for BandLab projects appear to have broken header information, which is probably why the tracks fail load/export.
Feel free to DM if you'd like to discuss more (including fixing it...)
Direct load/import of track data from BandLab into Cakewalk 2024.7 does seem broken for FLAC, but it seems that BandLab Assistant is able to download and make stems.