Radiobuttons can get unchecked (toggle) even though being exclusive, due to another sibling groupbox with own radiobuttons

When two radiobuttons shares the same parent and has a sibling groupbox with its own radiobuttons as childrens then the top level radiobuttons gets toggle-able, meaning that they can get unchecked both of them when they shouldn't. All radioButtons are set to be exclusive.

Basically when clicking on RadioButton 1 or 2 when the one you click on is already checked, it becomes unchecked. So the state would becomes of two unchecked RadioButtons in the same group.

-GroupBox1
   |-RadioButton1 (Child of GroupBox 1)

   |-RadioButton2 (Child of GroupBox 1)

   |-GroupBox2 (Child of GroupBox 1)

      |-RadioButton3  (Child of GroupBox 2)

      |-RadioButton4 (Child of GroupBox 2)

RadioButton 1 and 2 are set to be exclusive so only one can be checked at the same time but are toggle-able so that both can be unchecked.

RadioButton 3 and 4 works as intended, are also set to be exclusive.

RadioButton 1 and 2 does not effect RadioButton 3 and 4, nor does RadioButton 3 and 4 effect RadioButton 1 and 2.

The workaround is to not use nested groupboxes.