is this allowed?
bookmarks, outside of possibility.
There are plenty of things that spawn out in space like that. You can bookmark them and return to the spot, yes.
in a wormhole? what kind of things?
Some of the special event sites.
Incursions sites in HS will readily spawn outside of the largest orbit. Don’t know everything that will and won’t, and how rare it is, but I don’t think it’s a bug.