Corel Painter 2021 - Canvas Cut-off bug?

Hello there! I am currently evaluating Corel Painter 2021 and have the Trial version installed which is about to expire in a few days. I was doing some test and I seem to have found a major bug. I created a landscape document with the size of 1920 x 1080 and has 150 dpi. I was trying to use my Wacom pen and also my Mouse to brush over the right section of the Canvas but found out it was cut-off on the right section (pls. refer to enclosed image). I've already tried restarting the program, my PC, and re-created a new canvas with the same specs but the issue persists. 

I've already contacted Corel tech support and I was passed on to email support so I'm still awaiting their reply. Since I'm not sure whether I will receive a reply on time (before Trial period expires), I started looking for answers elsewhere which led me to this Forum. I am using Windows 10 Pro (64-bit) and my system passed the Brush Accelerator test having a varied score of 8000 to 9000+ (green color). But the AVX2 feature failed (red color) for me.

Am I missing something or is this an actual bug?