Pitch doesn't work on background music

When adding pitch to background music on sound_definitions.json (for example, adding pitch with the value of 2.0 to credits music), when the music start playing or by manually trigger it through /music commands it does not get pitched at all, while the pitch works correctly when triggered through /playsound.

Steps to reproduce:

1. Download and import the attached resourcepack, the pack changes the credits music pitch to 2.0

2. Open any worlds, then open Settings > General > Credits, alternatively, run /music play music.game.credits

3. The music does not get pitched

4. Stop the music with /music stop, and then run /playsound music.game.credits

5. The music pitched properly

Expected results:
Pitch works on background music.

Observed results:
Pitch doesn't work on background music.