The changing of the test results is part of a longer-told storyline with some noticeable plot holes. Heather's retcon daughter, Esme Prince, was targeting Portia's daughter, Trina, because of her connection with Spencer Cassadine. And Heather was escaping Spring Ridge to act as the "Hook," targeting those close to Trina.
I don't think they're dropping it, per se, but they definitely dropping a pairing that was not working in any capacity, whatsoever.
The Sopranos, Jill Farren Phelps & Robert Guza Jnr. That's how. 🤣
But, welcome to General Hospital and hope you continue to enjoy your stay, since the two present CBS soaps continue to be nothing but boring disappointments.