QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation) fails on Ubuntu Touch

When QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation) is called on Ubuntu Touch, the function returns an empty string and the following log can be seen:
"QStandardPaths: wrong permissions on runtime directory /run/user/32011"

The implementation seems to check for User RWX permission and if those are not teh exact permissions, it will try to set them (snippet from QStandardPaths:

       // "and he MUST be the only one having read and write access to it. Its Unix access mode MUST be 0700."
        QFile file(xdgRuntimeDir);
        const QFile::Permissions wantedPerms = QFile::ReadUser | QFile::WriteUser | QFile::ExeUser;
        if (file.permissions() != wantedPerms && !file.setPermissions(wantedPerms)) {
            qWarning("QStandardPaths: wrong permissions on runtime directory %s", qPrintable(xdgRuntimeDir));
            return QString();
        }

However file.permissions() return 0x77000 on Ubuntu (also on desktop), which causes the file.setPermissions() to be called.