I’m rendering FLAC files from WAV files that have IDv2 and RIFF metadata, and I have selected the ‘Inherit from Source File’ option in the Audio File Format dialog, but the exported FLAC files have no metadata in them …
The meta-data which is supported by WaveLab, is specific to FLAC (and OGG). It needs to be edited at the file format stage see:
I agree this is not as convenient as, for example, ID3v2.
To be improved.