What's up with the Shenyang WS-15 engine?

The WS-15 engine has been in development since the 1990s, and is meant to provide the J-20 with a supercruise capability similar to the F-22, a massive leap for Chinese aviation technology that would put it on par with the United States. But other than a test with the J-20 in 2023 there hasn't been any news about their progress, with other fighter jets like the J-35 being equipped with their own engines that allow them to supercruise. What's going on?