@alexs @l33t4opera Hi. No issues for me on AMD GPU with mesa and even with proprietary driver.
But in your case, from what I see in your log, you have "WebGL2: Software only, hardware acceleration unavailable".
So this mean that Opera not use HW for WebGL2. Maybe this is your problem because your previous build have "WebGL2: Hardware accelerated"
So, try go to opera:flags and enable this flag - Override software rendering list. Restart browser and check again.