Reported in: Ticket ID: 1524543. Reproducible in Chrome and Firefox. Not reproducible in Edge
Dojo example: https://dojo.telerik.com/iqUFarUV/3
On dragging the handle the column width automatically increases. Then if you try to decrease the width, you can't go past a certain width threshold.
The columns can be resized precisely, similarly to when their width is set in "px" instead of "%".