Main problem is that the corner radius changes as you can see in the video.
I also wanted to point out that Liquid glass was supposed to look like glass with reflections (iOS) but in this case you have opaque buttons and a transaparent background. I personally don't think it works well, it might be better to just have an opaque URL bar or blurred out background at the very least because the fully transaprent one looks weird with content underneath it.
For the main problem, keep corners consistent. Make them more rounded and be done with it, or keep the less rounded ones when displaying the URL bar in focus mode.
For the URL bar transparency, I expect to be able to see the URL bar without being distracted by the content underneath. At the moment there is no blur to disginguish what is in the URL bar vs the page underneath.
0.99.136.3.1-rc
Tahoe (26)