Hello,
I have now tried a different method to fix the issue which is Disable updates for Windows from registry (regedit). And then run the MediaCreationTool21H1 and It will fix the DTS:X Ultra issue and you will continue receiving Security updates even after disabling Windows Update. Also I have not used Bluetooth Media Devices since after the fix.
How to stop automatic updates on Windows 10 | Windows Central https://download.microsoft.com/download/d/5/2/d528a4e0-03f3-452d-a98e-3e479226d166/MediaCreationTool21H1.exe
Please check and let me know if it works for you too or not.
Thank you