This is actually coming from PHP's own trace dumping function: http://php.net/manual/en/throwable.gettraceasstring.php I'm not aware of any way to modify that function (short of entirely rolling our own version, which I don't see as necessary/compelling), thus I don't think there will be a change here/this is expected.
Though I'd note the line you highlighted isn't really a good example as the full message is at the top.