public beta 2's installation fixed this problem; the mountain is back! (just mentioning it). thanx all for ideas...
EDIT: the file restored by the beta is this: "Mojave (Dynamic).heic"; makes sense (and obviously the OS sees it as essential)...
EDIT: the file restored by the beta is this: "Mojave (Dynamic).heic"; makes sense (and obviously the OS sees it as essential)...
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