why does tumbler not support wav and wavpack thumbnails by default?

so I added these types to ffmpegthumbnailer.thumbnail MimeType=audio/x-wavpack;audio/x-wavpack-correction;audio/x-wav why does the wav thumbnail format run, but wavpack thumbnails don't? what should I do to display wavpack MimeType in Thunar?

wawpack uses APE2 type tags, this is the difference. but I don't think it should be a big problem. since most players support the cover when playing. at the moment I mostly use thumbnails for ffmpegthumbnailer music. but it seems it can't display wavpack. I tried to configure the GStreamer plugin, but could not figure out where it has a configuration file such as "ffmpegthumbnailer.thumbnail" for its settings. I searched the internet for 2 days. but there is nothing that could help with the wavpack format. I think it can be handled by gstreamer plagin. but I don't know how to configure it for this. PS the other audio and video formats work flawlessly.

Thunar 4.16.10 FreeBSD 12.2