Latest views/ruling about egg donation between wives of same man?

Recently, I stumbled upon this ruling https://islamqa.info/en/83799 about taking eggs from one wife of a man and implant the fertilized embryo it into another wife of the same man. From what I understand from this ruling is that it was first allowed but then deemed not permissible after further discussions. But the argument that has been given to make it not permissible is that the wife that will have the embryo implanted may already be pregnant through the relations from the husband so there will a confusion about the identity of the mothers if she gives birth to twins. Now, that ruling is from 1404AH (around 1983 and 1984). Maybe, at that time, technology was not that advanced but today's technology can tell us that whether a woman is already pregnant or not at the time of embryo implantation. In this case, most doctors today will not implant the embryo as the woman is already pregnant. Is there any new ruling in the light of new technology that is available? and what I know is that Shia muslims are allowed egg donations through a fatwa published in 1999 but sunni muslims are not but that's only my understanding. P.S: Please stick to the topic of egg donation between the two wives of the same man, not from a stranger woman.