The bug

The game calls all sound events with certain variables (most notible pitch, but also volume and whether it is global or not).
These variables cannot be changed by resource packs in any way shape or form, despite the sounds.json having corresponding fields (per sound file in a sound event).

Steps to reproduce

1. Place grass blocks, listening closely to the pitch of the sounds.
2. Run /playsound block.grass.place master @s ~ ~ ~ 1 several times, listening closely to the pitch of the sounds.
3. Observe the pitch is different, and as such the game calls the sound event with a pitch (0.8 in this case).

Expected result

The game would always call sound events with "default" parameters, and the sounds.json would handle said parameters with the fields in the sounds list/array.

Actual result

The pitch, volume and whether or not a sound is global are hardcoded and cannot be edited by resource packs.

Suggested change for when this gets fixed

To preserve the game's functionality of a pitch range, without having to create an event every single pitch, it might be good to give the pitch and volume options a min and max value, rather than only a single float.

{"name":"mob/zombie/hurt1",pitch:{min:0.7,max:1.3}