Pasting a cell value into multiple selected cells results in only the first cell in the range getting the value.
Steps to reproduce:
1) Go to https://demos.telerik.com/kendo-ui/spreadsheet/index
2) Click on cell B3 (Calzone) and press CTRL-C
3) Click on cell B4, hold the shift key and arrow down until cells B4-B7 are highlighted (or select the B4-B7 range with the mouse)
4) press CTRL-V
The outcome is only cell B4 receives the value of "Calzone".
All cells B4-B7 should have the value "Calzone".