For whatever it's worth (probably not much): I was curious enough to add the X11_Cinnamon_Factory repo in a Cin-desktop Tumbleweed VM. After zypper dup: Cinnamon version 4.2.2 completed boot for the first time ever, but (as Marguerite warned) without access to the settings menu, and without a panel icon for Network Manager. An improvement, though! Thanks again for your efforts on this, Marguerite.