Using the Stack Exchange Android App usage I attempted to "reply to" my own comment with the button. It worked and inserts
@Unihedron in my message box. This should be fixed, seeing that one cannot ping themselves.
Here are some pictures:
Hardware: SM-G3815 (Samsung Galaxy Express 2)
Software: Android 4.2.2 Build JDQ39.G3815ZHUAMJ6
Running app Stack Exchange version 1.0.48