Cubase audio stops working when any other audio used

Yes, the 2.1.2 fixes an issue where the WDM driver would remain stuck into a glitched state if the ASIO driver was loaded when DWM was already streaming audio at the same time. This was only a driver-related bug that appeared in the 2.1.0 version.

But since the original topic is from 2019, there was no such bug at that time, and being able to play audio from multiple applications simultaneously is only a matter of settings.

This is explained in the following guide :
Audio setup Guide for Windows