Thanks for sharing the save. I have seen when two planets are very close together the shipyard will become shared but will only get the benefit of one shipyard. To get around this you you'll find the shipyard will typcially appear in the south east of the planeet so you build at the Ruined Ringworld first and then Wardell 1. 

That said when planets are this close together you're actually just better coring the better planet anyways. There is only a 2% loss of input from the other core when they are that close. 

I'll bring it up to the community team. Thank you for the save.