UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Steps to reproduce the problem:
1. بث
2. بثب
3. 
ث

What is the expected behavior?
ثببببببببببببب

What went wrong?
بثثثثثثثثثثثثثثث

Did this work before? N/A 

Chrome version: 54.0.2840.99  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 23.0 r0

بثثثثثثثثثثثثثث