The auto generated cover art cannot show correct title

[peter21488]

Hi, I'm using the Subsonic 6.1.6 with debian docker on my own VPS.
If the song / folder do not have any cover art, subsonic will auto generate the cover art for it.
However, my song title has some Japanese / no-English character, and the generated cover art's title / name will be garbled code. But It can show correctly on the song info (when playing).

How to fix it? (Change the encoding setting ?)
or Can I use the custom default cover for ALL songs?