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
56762 NEW --- nor Branch p NetworkM sem senkd Отключается Wi-Fi и требуется повторный ввод пароля от сети

File a new bug in the "NetworkManager" component of the "Branch p11" product