APIC frame missing from MP3 when added by kid3

[Christilut]

I've added a cover image using kid3 and when I read the tags using mutagen.File(file_path) and simply print that, there is no APIC frame in there. The thing is that kid3 does recognize it and so does another program called TagScanner. When I added an image using TagScanner, the APIC frame is in the output and readable by both kid3 and TagScanner.

It's strange that there is no APIC frame at all in the raw tag output.

This may be a kid3 issue but since TagScanner can read it, I'm thinking it might be mutagen related.

You can download the MP3 here

Using mutagen 1.45.1