As the topic said i have accidently deleted some stock objects in my mod, unsure quite how many, but atleast CaveGLWallDoorL01 seems to be deleted, how can i get it back into the mod and re-enable it?

Edit: I deleted the actual object from the static list that is (somehow) its not a matter of something i deleted in the render window.

Open your plugin as active, File > Data > Details, select your plugin, sort by "Deleted", use delete key on "Deleted" forms to mark them "Ignored", then save/close.

Ah, thank you very much.