Why validation of dropdown field is triggered even though the field value is null?

Question

a!localVariables(
 local!singleDropDownValue,
 local!multipleDropDownValue,
 {
 a!dropdownField(
 label: "Single Dropdown",
 placeholder: "Select",
 choiceLabels: { "Jane", "Jack" },
 choiceValues: { 1, 2 },
 value: local!singleDropDownValue,
 saveInto: { local!singleDropDownValue },
 validations: "Error..."
 ),
 a!multipleDropdownField(
 label: "Multiple Dropdown",
 placeholder: "Select",
 labelPosition: "ABOVE",
 choiceLabels: { "Jane", "Jack" },
 choiceValues: { 1, 2 },
 value: local!multipleDropDownValue,
 saveInto: { local!multipleDropDownValue },
 validations: "Error..."
 ),
 a!buttonLayout(
 primaryButtons: a!buttonWidget(label: "submit", submit: true)
 )
 }
) 
 Expecting validation to trigger only when the field value is not null. It works for multiple dropdown, but why not for dropdown?

Mike Schmitt · Answer

Edit: i misunderstood sorry, I can reproduce this behavior on Single Dropdown - i agree it seems like an error.

Why validation of dropdown field is triggered even though the field value is null?

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