As is usual with mysterious "permission denied" errors, SELinux was the underlying cause. ...
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ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
45866 NEW --- nor Branch p flamesho x09 kiriukhinaaa Некорректное отображение рабочего стола при создании снимка в flameshot.

File a new bug in the "flameshot" component of the "Branch p10" product