Describe the bug
I've been trying to modify an entities loot table that uses a custom function and condition, but having trouble to get it working properly. I copied the function and condition json directly from the loot table dump, only modified what item it's suppose to drop.

This is my current entry:

pool.addItemEntry(<pyrotech:generated_slag_syrmorite>, 3, 0, [{
                            "function": "thebetweenlands:set_count_from_anadia",
                            "size_start": 0.125,
                            "size_end": 0.95,
                            "min_count": 4,
                            "max_count": 8
                        }], [{
                            "condition": "entity_properties",
                            "entity": "this",
                            "properties": {
                                "thebetweenlands:anadia_body_type": 0
                            }
                        }]);

But after restarting i get the message "Missing condition, expected to find string". Sometimes it says "missing function" instead.
Dumping the loot table after my modification shows this:

{
          "entryName": "loottweaker#1",
          "weight": 3,
          "quality": 0,
          "conditions": [
            {
              "properties": {},
              "entity": "this",
              "condition": "minecraft:entity_properties"
            }
          ],
          "type": "item",
          "functions": [
            {
              "size_start": 0.125,
              "size_end": 0.95,
              "min_count": 4,
              "max_count": 8,
              "function": "thebetweenlands:set_count_from_anadia"
            }
          ],
          "name": "pyrotech:generated_slag_syrmorite"
        }

For the most part everything got copied over properly, except for the properties field, which is empty.

Any idea what i might be doing wrong?

Cheers!

Version Info (Exact versions only):
LootTweaker: LootTweaker-0.3.0+MC1.12.2.jar
CraftTweaker/Minetweaker: CraftTweaker2-1.12-4.1.20.660.jar
Forge: 2854
Minecraft: 1.12.2

It's a known issue with 0.3.0. The new parser breaks when the passed JSON object contains another JSON object, a scenario not covered by LootTweaker's test suite. ZenScript tries to deserialise the nested object as another condition/function, instead of parsing the whole thing at once.
I've yet to have the time and motivation to look into it further, but Uni is calming down so I should be able to soon.

Unfortunately the deprecated methods use the new parser too, so they have the same issue. The only "solution" is downgrading to 0.2.0.

Ahh that makes a lot of sense, was wondering if it was the nested one. Okay cool i'll switch to 0.2.0 in the meantime then. And no worries, totally understand the lack of motivation/time part.

Fixed in 0.3.1
https://www.curseforge.com/minecraft/mc-mods/loottweaker/files/3507866

Found time to take a look at this, but I'm utterly stumped. I know what's happening, but not how to fix it.
I've created a variant of 0.3.0 with the old parsing system so that users can benefit from 0.3.0's bugfixes. It's available here and will be on CurseForge soon.