After converting the FLAC format to MP3, the images in the metadata are lost

[ffqwq]

After converting the FLAC format to MP3, the images in the metadata are lost.
I can't get the album cover image of the song in the metadata after conversion with both 3.5 and 2.6, is it because the project is not designed or is there a problem with my use?If it's the former, is it a bug or is it intentional?Although it is not very necessary, it is mad that I can't get the full song after converting

[a-schild]

For this, you need to pass the copy video data argument

-c:v copy

https://stackoverflow.com/questions/74957184/ffmpeg-converting-flac-to-mp3-changes-front-cover-image-format-and-size