Cursor jumps to start of address bar after opening a new tab
In Tech Preview, open any URL in a new tab (e.g. by Ctrl+click on a link, or right click -> open in new tab). Try to select some portion of the URL in the address bar. The first time you attempt to select the text, the cursor will (probably) improperly jump to the far left position, which is annoying.
It's not 100% reliable and it sometimes happens in existing tabs too, but opening the URL in a new tab is to be the most reliable reproducer I've found.