If you claim that it's a bug you have to provide information what exactly not working.
Your first screenshot shows that you use wrong search term.
After that you said that none of other variations that i mentioned is not working too. Both of them are working actually.
Show some proof then to identify bugs, that you're talking about, how to reproduce them, or this thread has no value.
Twitter has serious source code structure and if you dont see attributes you're looking for when you hover mouse over the element it doesn't mean that they are not there.
Open Firefox, install firebug and check full source code if you need to to identify which attributes you can use in action designer.
Your second screenshot shows that you're checking attributes for label tag when you need to work with inputs. So it shows nothing for me.