I'm using version 1.25 downloaded from steam. Windows version is 22621.521
I just did a fresh reinstall of the steam version and of the 1.27 beta version, same problem with both of them. Selecting "Pin to Start" in the context menu won't pin the icon to Start11 menu. "Syncronize pinned items from the OS menu with Start11" option is enabled.
Was Start11 tested with 22H2 windows 11 update?