https://gist.github.com/Moleculor/54429b50951681f113c9c84f8e1dfeb2

	Mod List: 
		forge-1.16.4-35.1.13-client.jar                   |Minecraft                     |minecraft                     |1.16.4              |DONE      |NOSIGNATURE
		forge-1.16.4-35.1.13-universal.jar                |Forge                         |forge                         |35.1.13             |DONE      |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
		AutoRegLib-1.6-47.jar                             |AutoRegLib                    |autoreglib                    |1.6-47              |DONE      |NOSIGNATURE
		Quark-r2.4-283.jar                                |Quark                         |quark                         |r2.4-283            |DONE      |NOSIGNATURE
		jei-1.16.4-7.6.0.58.jar                           |Just Enough Items             |jei                           |7.6.0.58            |DONE      |NOSIGNATURE

0. Install Forge, obviously.
1. Install Quark.
2. Install JEI.
3. plus whatever AutoRegLib or whatever is required.
4. Launch the game.
5. Create a new world.
6. Open inventory.
7. Search for "@quark" in JEI.
8. Start hovering over various items in JEI on the right hand side and hitting R or U on your keyboard.

Preface: I haven't actually used Quark much, so I may list some items that actually don't have uses? I'm trying to be careful and cross-check things on the website, but it's not easily searchable without manually Ctrl+Fing on the seven or eight separate fancy tabs. Apologies if I end up listing something that lacks recipes or usages in JEI because they lack them in reality.

Also, I just tried guessing at what a few of these recipes might be and didn't get the expected items, so maybe this stuff just isn't implemented at all? But Quark 283 seems to be listed on CurseForge as 'Release' rather than 'Alpha' so... I'm still leaning towards a bug, rather than just unimplemented features?

Many items in Quark have recipes listed JEI just fine, but a few don't. These include, but may not be limited to:

• Non splash potions (recipes to make them)
• Crystals and sheets (usages and recipes, respectively)
• Redstone components
• Cobbedstone stairs and walls (you can pull up the recipe for a wall by accessing the usage for slabs, but not by directly pulling up the recipe for the wall)
• Polished and non-polished stairs, polished blocks, non-polished walls, bricks, chiseled bricks, pavement, and pillars of
  • Marble
  • Limestone
  • Jasper
  • Slate
  • Voidstone
  • Myalite (and the crystal)
  • Biotite
  • Permafrost
  • Brimstone
  • Elder Prismarine
• Weather detector
• Some Ancient Tomes usages (Protection and Fire Protection, for example), but not all.
• Chutes (burn time shown, but no crafting recipe)
• Iron Rod
• Cave roots (usages, I'm guessing they may not have a recipe?)

Never mind. Despite this being a fresh install of Quark downloaded manually through GDLauncher and not part of some pre-configured modpack, nor preconfigured in any way, somehow a ton of the default world generation options were set to false and would refuse to switch over to true when told to save them as true. Deleting and regenerating the config file fixed the issue, fixed world generation, and restored the recipes in JEI. 🙄

No idea what went wrong or how it happened.