"Mark as unread" option not working

[LucasDondo]

When holding a chat and moving the finger to the "Mark as unread" option it doesn't display anything (Such as a bubble) to advice me that I hadn't read that chat. Although if I repeat the shortcut, I will be as read (It will display the "Mark as read" option instead of the "Mark as unread").
I hope this can be solved ASAP!! And thanks for the Telegram X awesome proyect!!