If you use a creative music disc to play music from a mod rather than Minecraft it doesn't play in the radio jukebox even though it works in the vanilla juke box and the sound is playable with /playsound.

Could you please try to reproduce this in a newer version?

Using 0.1.2 on 1.17.1 shorter sounds work but I have a custom sound I added with a mod that doesn't work in the radio jukebox but works in the vanilla jukebox. It also works with /playsound and has the stream option set to true due to it's length.

I was able to reproduce this issue on v0.3 and 1.18.2. The custom sound also works with /playsound and in the vanilla jukebox. My logs are attached: https://pastebin.com/Ve96eLq5