Hristo,
This issue occurs even without a cellbeginedit handler on the column.
Fiddle: https://jsfiddle.net/jroj3o0a/6/
Click anywhere in the grid other than a Product column cell and type some text. Click any Product column cell, last character from keyboard replaces text. Seems to happen only with alphabetic and numeric characters, not with special characters.
Can you give status of work item or suggested workaround?
