Seems like Tyrannosaurids from Larimidia were scaly. Based on Gorgosaurus, Albertosaurus, Daspletosaurus and Tarbosaurus from Asia. So somewhere along the line from early Tyrannosauroids in Asia they must have secondarily evolved scales again. The scales found in Tyrannosaurids were very small, a little bit like bird reticula and it was hypothesised this might be their origin but the authors of the study couldn't confirm either way. I think you likely had feathers and scales independently revolving numerous times. It does raise the question of why Yutyrannus had feathers but smaller Tyrannosaurids didn't. The climate wouldn't have been all that different at least for part of the year. It's possible Yutyrannus lived in forests that made proto-feathers more important for thermo regulation. I do wonder if Tyrannosaurids slowly lost their feather covering and then developed scales instead to protect from UV and just generally provide protection. It does seem an odd development. We don't really know if their scales were homologous with other dinosaur scales and whether they were mutually exclusive with feathers coverings. Usually scales and feathers are mutually exclusive but not always. If any of them did have feathers they would be only on a small part of the back. It's also possible the situation was similar to African Elephants who have a small sparse covering of hair. That would be more reasonable if the Tyrannosaurs had skin impressions without scales. But as said scales are usually mutually exclusive with feathers. Then again bare in mind we are dealing with time periods longer than a lot of the more recent evolution seen in mammals. So yes it seems weird Tyrannosaurs lost feathers and redeveloped scales with no trace of that ancestral feather covering however Yutyrannus and highly derived Tyrannosaurs of the late cretaceous would have a far greater separation in time than modern mammals that have lost much of their hair covering.