Elder Guardian sounds unaffected by "replace" in sounds.json

I'm a relatively new resource pack developer and I've encountered a minor issue. I am able to add custom sounds to virtually every sound event in the game except for "entity.elder_guardian.curse".

I am able to individually replace the sound, but there seems to be no way to insert additional sounds in this slot. I'm currently attempting to add six new sounds like this:

"entity.elder_guardian.curse": {
"replace": true,
"sounds": [
"mob/guardian/curse1",
"mob/guardian/curse2",
"mob/guardian/curse3",
"mob/guardian/curse4",
"mob/guardian/curse5",
"mob/guardian/curse6"
]
}

When I get cursed ingame, it just plays the default curse sound. Playsound plays the default sound too.

EDIT: This seems to be the case for all Elder Guardian sounds.
EDIT 2: Pandas are also unaffected by "replace".
EDIT 3: I miraculously found the solution... If only there was a way to easily identify any user errors that were made in the sounds.json file. Sorry!