Audacity supports RF64, which is a BWF-compatible multichannel audio file format enabling file sizes to exceed 4 GB. Why not use RF64 instead?
Another option might be FLAC format.
The audacity “edit metadata tags” tools isn’t BWF compliant.
They are so few SAE that are full compliant, I don’t even know one. each developper only add the BWF part of code required for is need, never the full one. (it’s a 2003 strandard !)
As I wrote, ZOOM is using this BWF format (other recorders do it also). While recording you can add “mark” in the file. These are BWF markups.
Should be read as metadata, even better as “labels” by audacity.