After upgrading from bullseye to bookworm a few days ago which included an upgrade of cinnamon there is a problem with the redirect to the browser (like firefox) while clicking a URL in a program (like thunderbird). The click will make firefox open a new tab but not switch to the virtual desktop. Clicking a second time on the link switches to the browser virtual desktop and opens a second tab with the link. This behavior is reproducable with three desktops I updated. If you need more information let me know. Yours Christoph