Photoshop version: 26.11.0 ("up to date" according to Creative Cloud app)
System: macOS Tahoe 26.0.1
Steps to reproduce: Open a new document, make some edit, close the document (CMD+W). In the dialog that opens and asks if you want to save, don't save or cancel, try to use the tab key to switch to the discard option. It doesn't work. The only way to discard unsaved changes is to use the mouse.
Expected behavior: Tab key should switch between every available option in dialogs, so you can press spacebar to choose that option.
The same behavior is seen in other dialogs, such as when trying to do something that would cancel an open action (e.g. editing a text box). Tab key just removes focus from any option and it never comes back. Only escape key (cancel) and return (choose the default option) work.