Issue Procedure
1. Enter the header and then type "마스터"
2. Copy and paste "마스터" one after another
3. Move the cursor to the header and enter "마스터"
Expected Result
"마스터" text should be entered.
Actual Result
"마스터" texts are not entered and the first text is truncated.
Please check image below
Version : 6.15.8
This bug occur only Chrome browser.
