Why do mods have Turkey dinos and Xmas structure in them.

Every mod I cook gets a /primalearth/dinos/turkey/ and /primalearth/structures/christmas/ added to it even when those folders and assets are not in my mod folder.
No luck googling for the issue.
Cannot find any reference in the cooking setup that would add something I did not include.
I found lots of other people’s mods have the same.
Is this a bug in the dev kit?
can I delete the files from the temp folder before I upload to steam or will that break the mod?
Many thanks, Mike