You can't import JSON with newlines in strings, even though Minecraft can parse it without issue.

[DorkOrc]

For example, Minecraft reads and parses this just fine (in 1.20.4):

{
	"pools": [
		{
			"rolls": 1,
			"entries": [
				{
					"type": "minecraft:item",
					"name": "minecraft:splash_potion",
					"functions": [
						{
							"function": "minecraft:set_nbt",
							"tag": "
								{
									Potion: \"minecraft:water\", 
									custom_potion_effects: [{id: \"minecraft:blindness\", duration: 400}], 
									CustomPotionColor: 2039587, 
									display: {
										Name: '{\"italic\":false,\"text\":\"Splash Potion of Blindness\"}'
									}, 
									RepairCost: 2147483647, 
									pandamium: {
										id: \"blindness_splash_potion\"
									}
								}
							"
						}
					]
				}
			]
		}
	]
}

But the generator doesn't seem to like it very much

A weird edge-case, I know, but I found formatting the SNBT like that when writing the loot table helpful, and I noticed that I couldn't import it to make edits 😅

[misode]

This looks extremely cursed. I don't know if I want to support "malformatted" JSON like this. I already somewhat support comments in JSON, but this is next level 😅