I know it’s still experimental, but I have found an issue. I have a desktop and use seamless mode to scroll the icons. All works well. However, I went to edit that desktop and upon selecting Edit Layout, the desktop disappeared. I had to zoom right out and scroll many many screens down to find my desktop, bring it back into the display and make my change. It had literally gone into outta space. Then the desktop would just not scroll correctly. Icons all misaligned. I turned off seamless mode, tried again, and it worked like normal.  I can repeat this every single time. So when going into edit layout mode, I think the seamless mode needs to be switched off until all changes are made.