I clearly mentioned. ONLY FLAC.

With FLAC ONLY it does not work.
With Wav + wma it DOES work.

If I were a 2025 Audiophile user I'd be concerned what the plugin is using. Perhaps you (or somebody) could test and have a look at the spectrum (.fft) of a song (or single drums track) when using the DAW plugin. Perhaps the plugin is using WMA.