DisplayLink Forum - Elementary OS 5 Juno Dual Monitors Working on Nvidia Propietry Driver

I have ASUS MB169B+ USB monitor which has a DisplayLink chip. I installed both the NVIDIA proprietary driver and DisplayLink driver. It is clearly mentioned on DisplayLink website under known limitations "Closed source AMD/NVIDIA drivers are incompatible with DisplayLink driver. Please use open-source AMD/NVIDIA drivers instead.
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Therefore, I switched my graphics card to Intel via Nvidia Optimus "prime-select intel", after switching to the intel my DisplayLink monitor started working.

However, today when I switched back to Nvidia graphics card again via "prime-select nvidia" and restarted my computer I can still see both my laptop monitor and DisplayLink monitor working which not only has surprised me but also put me in doubt and I took this screenshot.

https://preview.ibb.co/ftfOQf/displa...ith-nvidia.png

After executing a few commands to verify what card is being used I am still not satisfied, can anyone here please suggest if this is something which actually is working and if yes then how?

HTML Code:

root@linux-laptop:~# lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA

00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:591b] (rev 04) (prog-if 00 [VGA controller])

01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP106M [GeForce GTX 1060 Mobile] [10de:1c20] (rev a1) (prog-if 00 [VGA controller])