From Steam, Creeping Deck Demo, The Last Campfire Demo, and Spiritfarer Demo are not imported at all.  From Epic, Crying Suns Demo was uninstalled but remains in the Installed/Yes view... except it just vanished from there after I inspected it..?
 
	The two titles that are imported but don't show, one each from Steam and Epic, are games which I also own on Amazon.  Instead of allowing me to play them via <ctl-P>, there is a "Play version..." menu  (andf also with only one version in it.  For each, there is a menu option to install, clicking these brings up the Amazon Games app.
 
	Some of this I just figured out, but at least we have some idea what's going on now.
 
	There is another game I own on both Epic and Amazon, but neither version is installed.  Clicking Install on his starts the install process on Epic.  Isearched and found a game I own on both Steam and Amazon, clicking Install on this starts the insttall process on Steam.  It is possible to install the Amazon versions, as a second level option.
 
	Please let me know if you need any more information.