Multidropdown in editable grid

Multidropdown in editable grid is working weird. I have a multidropdown on a editable grid which is not allowing me select all the values what i want. The list on screen should appear until i click somewhere in the form instead i have to click the DD each time and then select a value. The selected values are stored in an array in a CDT which is correct.

is this the default behavior of Multidropdown in a editable grid/ any work around ?

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