Not if there is no geostrategic gains from it. In fact, no Muslim country, especially financially weak ones (such as Pakistan and Turkey) would dare to rub China the wrong way. Earlier, Turkey used to show some courage and express its concern about East Turkestanis, but given the recent economic turmoil in Turkey, that has been stifled as well.
Saudi Arabia and other Arab countries being American allies, would prefer if China kept mistreating Uyghurs and other muslims in China, as it gives the Americans another issue to corner the Chinese.
Iran, well had the Uyghur been Shia, Iran just might have raised its voice. But then again given the sanctions and isolation Iran is facing, that wouldn't have happened either.
Tl;dr there is no Islamic ummah, there never was one. Islamic countries have been using this Islamic brotherhood nonsense for geostrategic gains. Thanks to China and its economic clout, this hypocrisy is now exposed and for everyone to see.