Have they solved the issue where papers that cite research already invalidated are still being cited?
Nope.
I am still reviewing papers that propose solutions based on a technique X, conveniently ignoring research from two years ago that shows that X cannot be used on its own. Both the paper I reviewed and the research showing X cannot be used are in the same venue!
AFAIK, no, but I could see there being cause to push citations to also cite the validations. It'd be good if standard practice turned into something like
Paper A, by bob, bill, brad. Validated by Paper B by carol, clare, charlotte.
or
Paper A, by bob, bill, brad. Unvalidated.