Issue with XV273K in "144hz dual DisplayPort mode" and Windows 10 "Fluent Design Acrylic Effects"

I observed a very strange issue (maybe a bug) in Windows 10 when I activated the dual DisplayPort cable mode (for 144 hz at 3840x2160 resolution) on the monitor. Immediately after the option was activated in the monitor settings the “Fluent Design Acrylic” blur effect behind the Taskbar disappeared (became black and transparent) and all other animation and transparency effects like "Reveal" and so on were completely disabled (even the option in the settings page that says that they are “ON”). This issue is immediately gone after unpluging one of the display port cables and the monitor starts to run in normal 120hz singe cable mode. After days of inspecting the issue, including creating a custom resolution with CRU (resolution editing program); switching the cables; uninstalling the Nvidia drivers in safe mode with DDU (Display Driver Uninstaller program) and after that a clean installing the latest one) the bug/issue continues to exist. I have doubts that there is something wrong with my current configuration (installed drivers, specific settings in Windows) so I decided to do a fresh install of windows 10 in separate HDD to see is if the problem exist. Without the Nvidia driver being installed or anything else from the first boot to desktop of the new installation, the non-functioning effect bug/issue is there! After installing the latest driver from Nvidia – same. The strange thing is when Windows 10 is running (with the above described issue) and I turn off the monitor from the power bottom and then turn it on again the Taskbar immediately restores the "Acrylic" blur  effect activated and after restarting explorer.exe the whole Fluent Design Acrylic Effects are on/restored as they are supposed to be! But when the monitor goes to sleep mode everything goes back to this “disabled animation/effect mode”. This makes me thing that the problem is somewhere inside the Windows itself and the ability to detect the monitor in this unusual dual DisplayPort cable mode. I inspected the default resolution that the CRU sees and there is strange entry in the "Detailed resolution" section of 2000x1000@59hz and another one 3840x2160@30hz.

So the thing that I hope and ask the community in this forum is:

1. If someone who has the XV273K monitor is able to check if this issue appears in his setup,

2. Is there someone else who has noticed this behavior,

3. Is there is someone who knows a fix or walkthrough through it.  

Here is the example of the issue:

And here is example of the normal Windows 10 behavior:

And the CRU readings: