I have a weird issue, I think?

1) I make a new World Space.

2) I go to an existing World Space.

3) I highlight things in that world space, and Copy them.

4) I use "Paste in Place" to paste the items into my new world space.

5) If I delete an item from this world space, occasionally I will get a message that it is reference by an item in the original worldspace...

So, for example, if I delete an x marker, I might be told that it's referenced by "Spawn Marker" in the original worldspace...

this does not seem right to me? Because, the items in the original worldspace should be untouched and unchanged, and still referencing things in their worldspace... So, how do I copy things from one worldspace/Cell to another, without it making these weird references between Cells?

Thanks for the help.