For some reason I cant find the config file anywhere. Yes I looked in the config folder where all my other mods' config files are.

Also the reason why I'm looking for the config file is because one of my friends on my server found an Aether dragon egg in a dungeon chest (a vanilla dungeon). I personally only want the eggs to come as an extra reward from killing the End dragon which gives more incentive. I thought they didn't spawn in chests by default but this may or may not be a bug, so I'm just throwing it out there.

Same problem still now. Gonna have to disable this mod sadly until its fixed

This isn't a bug. They are meant to be found in chests.
If you do not wish to have these, you can use a datapack to remove the entries for the loot tables. DML uses a custom "injects" path that you can refer to. It can be found in the mods resources, and also in this github for reference on how to design the datapack accordingly.
(Specifically here )
And if you need help making a datapack, you can refer to the Minecraft Wiki

I don't want to disable it completely I just want to make it more rare. Most mods come with a config

again you can do that with the datapack feature. A config option requires other more annoying hoops that needs to be jumped through, and mojang is pushing for datapacks. So, I follow suit.

so i have to create a datapack to edit your mod?

Same arguement as you need to make a datapack to change mojangs features. Same as configs. Datapacks are more flexible than configs. so yes. They aren’t hard to make, it takes 5 minutes if you follow the wiki.