Steps to reproduce:
Open a new Start Page tab. Either drag the tab to create a new window or right click the tab and select move to new window. The new window will display the text "Search or enter website name" twice. One is left/leading aligned (as it should be when it has focus) and one is center aligned (as it should be without focus).
The new window should open and the search bar should have focus, and the "Search or enter website name" placeholder text should only appear once, left/leading aligned. This would match Safari's behavior.
Orion and macOS:
Orion 0.99.109.1-beta (WebKit 613.1.12)
macOS Version 12.1 (Build 21C52)