BWF MetaEdit was developed by the Federal Agencies Digital Guidelines Initiative (FADGI) supported by AudioVisual Preservation Solutions.
This tool permits embedding, editing, and exporting of metadata in Broadcast WAVE Format (BWF) files. This tool can also enforce metadata guidelines developed by the Federal Agencies Audio-Visual Working Group, as well as format specifications from the European Broadcasting Union (EBU), Microsoft, and IBM.
My theory is that one of the formats/apps is more forgiving than the other and is allowing the “zero” in position 5 when the ISRC spec is AB-CDE-12-34567 while another format rejects it because in position 5 there is a number and not a letter.
For testing purposes, I would consider changing the ZERO to the letter O and see if that changes how certain apps display and interpret it.
I know you’re copying and pasting from somebody else’s data but that data could be wrong.
Even after seeing your note about it working when using the Audio Montage, this is still work checking in my opinion as everything else seems kosher.