Hello, I'm currently working on a small personal modpack for myself where you play in a superflat desert that has a body of water underneath the surface. At first, I was trying to get the "Thrasher" mob from the Upgrade Aquatic mob to spawn using potentialspawn.json and spawn.json, but for the life of me couldn't figure it out. So, I decided to try to spawn squids instead, just to see if it was a problem with Upgrade Aquatic and not my code. However, once I again, I can't get them to spawn at all. I've tried adding new squid spawns using potentialspawn.json, I've tried changing literally every available parameter on the wiki for both spawn files, I've tried setting the spawn block for squids to be minecraft:water, minecraft:dirt, minecraft:air, I've tried using the onjoin parameter set to true, I've tried setting minlight to 0 and maxlight to 15, I've set seesky to false (spelled both seesky and seasky), and I've tried setting "canspawnhere" to both true and false. I've genuinely tried everything I can think of at this point, and was wondering what I could be doing wrong. I also tried this with dolphins, and got the same results.

Here's the final spawn.json I tried with all the parameters set accordingly:
[
{
"mob": ["minecraft:squid"],
"biome": "minecraft:desert",
"biometype": "SANDY",
"seesky": false,
"tempcategory": "warm",
"canspawnhere": false,
"minheight": 118,
"maxheight": 142,
"minlight": 0,
"maxlight": 15,
"maxcount": 1000,
"result": "allow"
}
]

And here's the final potentialspawn.json I tried:
[
{
"dimension": "minecraft:overworld",
"mobs": [
{
"mob": "minecraft:squid",
"weight": 5,
"groupcountmin": 1,
"groupcountmax": 2
}
]
}
]

Note that I've tried moving all parameters I could between the two files as well, and I've also tried removing the "dimension" from potentialspawn.

Any help would be greatly appreciated!