I had that happen with mine, where the port AND namespace completely disappeared from the connection objects. I had to add both back in at the lowest level, then close VSCode and re-open it for the changes to take effect. (Closing the Workspace probably also would work).

(I also installed the IS Server manager extension before checking the ObjectScript tab. I don't think that changed anything, but mentioning it just in case.)

I wonder why we can't edit the connection settings directly from the extension settings themselves anymore, but I guess that's a question for the repo.