Apple Lossless Music maxing out at 96 kHz.

My set up includes the latest iMac with M3 chip, an external Burson DAC capable of playing 16 integer 382 kHz and powered am - speakers. I have set Apple Music to Hi Res lossless 192 kHz. I have tried number of songs in all varieties and measured Sample rate wt Lossless switcher app. It shows the maximum sample rate is not beyond 96 kHz. why is it so? Is it the maximum that Apple Lossless is streaming? I used to get much higher sample rates on Tidal.