DropdownMenuItems are not rebuilding flutter using DropdownButton2 - flutter

Question

My dropdown list has a multi-select feature. I have shown the list and selected Items are saved in an array called selectedClassList. Basically, it's a normal checkbox procedure.
But in the scenario of clicking a value called "any", I need to unselect all other items and need to mark "Any" as selected. The same is for other items, when a user clicks any of the other items, then item "any" should get unselected.
My code is like
DropdownButtonFormField2<dynamic>(
itemHeight: 40,
dropdownOverButton: false,
buttonWidth: double.infinity,
selectedItemHighlightColor: Colors.grey.shade300,
isExpanded: true,
value: widget.value,
dropdownElevation: 0,
itemPadding: const EdgeInsets.only(left: 15),
buttonDecoration: BoxDecoration(
border: Border.all(color: Colors.black87, width: 1),
borderRadius: BorderRadius.circular(5),
),
decoration: const InputDecoration.collapsed(
hintText: '',
border: InputBorder.none,
),
isDense: true,
offset: const Offset(0, -2),
iconSize: 20,
buttonHeight: 50,
buttonPadding: const EdgeInsets.only(left: 15, right: 10),
focusColor: const Color(0xffFFFFFF),
hint: const Text('Select One',
style: TextStyle(
fontSize: 14,
fontFamily: 'Poppins, Regular',
color: Color(0xffAAAAAA))),
style: const TextStyle(
fontSize: 14,
fontFamily: 'Poppins, Regular',
overflow: TextOverflow.ellipsis,
color: Color(0xff121212)),
iconOnClick: AnimatedRotation(
turns: 0.5,
duration: const Duration(milliseconds: 300),
child: Icon(Icons.arrow_down),
),
icon: AnimatedRotation(
turns: 1,
duration: const Duration(milliseconds: 300),
child: Icon(Icons.arrow_up),
),
dropdownDecoration: BoxDecoration(
border: Border.all(
color: Colors.black45,
width: 1,
),
borderRadius: const BorderRadius.all(Radius.circular(5)),
shape: BoxShape.rectangle),
dropdownMaxHeight: 200,
items: getClassDetails.data?.map((item) {
return DropdownMenuItem<dynamic>(
value: item,
enabled: false,
child: StatefulBuilder(
builder: (context, menuSetState) {
var _isSelected = selectedClass!
.where((element) =>
element.settingName == item.settingName)
.toList()
.isNotEmpty;
return InkWell(
onTap: () {
if (item.settingName == "Any") {
selectedClass!.clear();
}
if (_isSelected == true) {
selectedClass!.remove(item);
} else {
selectedClass!.add(item);
}
setState(() {});
menuSetState(() {});
},
child: Row(
children: [
_isSelected
? const Icon(Icons.check_box_outlined)
: const Icon(Icons.check_box_outline_blank),
const SizedBox(width: 16),
Text(
item.settingName.toString(),
style: const TextStyle(
fontSize: 14,
fontFamily: 'Poppins, Regular',
color: Color(0xff121212)),
),
],
),
);
},
),
);
}).toList(),
)
I am not good at explaining things. Kindly let me know if I made any mistake.