bug: Nested checkboxes inside a radio group influences the radio group selection

[Kernolsie]

Bug Report

Ionic version:
Yes 4.anything
[x] 4.x

Current behavior:
Nested checkboxes inside a radio group influences the radio group selection.

Expected behavior:
I have a nested selection list:
Radio1
Checkbox1
Checkbox2
Radio2
etc.
The checking of the checkboxes should have no influence on the radio selection. How do I encapsulate the checkboxes?

Steps to reproduce:
Make a radio group with a few radio options, inside the radio group make a few checkboxes. See how the radio selection changes as you select a nested checkbox

Related code:
https://stackblitz.com/edit/ionic-4-template-8bbqgj
I have put the output of the radio selection at the bottom of the home page. You'll see that as you click a checkbox then the radio-selection string becomes "on" as default

<ion-list>
		<ion-radio-group [(ngModel)]="radioOption">
			<ion-item>
        <ion-radio slot='start' value="option1"></ion-radio>
            <ion-label>Radio1</ion-label>
			</ion-item>
      <ion-item class='indent'>
        <ion-checkbox slot='start' [(ngModel)]='checkboxValue1' (ionChange)='checkBoxChanged()'> </ion-checkbox>
            <ion-label>Checkbox1</ion-label>
			</ion-item>
      <ion-item  class='indent'>
        <ion-checkbox slot='start' [(ngModel)]='checkboxValue2' (ionChange)='checkBoxChanged()'> </ion-checkbox>
            <ion-label>Checkbox2</ion-label>
			</ion-item>
      	<ion-item>
        <ion-radio slot='start' value="option2"></ion-radio>
            <ion-label>Radio2</ion-label>
			</ion-item>
		</ion-radio-group>
	</ion-list>

[ziftytodd]

This problem isn't limited to checkboxes. I have the same issue with ion-input nested inside an ion-radio. Whatever is typed into the ion-input becomes the value for the ion-radio-group, despite having different formControlName set on the ion-input and the ion-radio-group.

[ionitron-bot]

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