bug: Radio Group over multiple lists

[HansKrywalsky]

Package version

9.0.1

Environment

macOS 26.6.1 (25G76)

Minimal reproduction

<ion-radio-group>
  <ion-list [inset]="true">
    <ion-item-group>
      <ion-item>
        <ion-radio [value]="null">System default</ion-radio>
      </ion-item>
    </ion-item-group>
  </ion-list>

  <ion-list [inset]="true">
    <ion-list-header>
      <ion-label>Header</ion-label>
    </ion-list-header>
   
    <ion-item-group>
      <ion-item>
        <ion-radio [value]="id1">Voice 1</ion-radio>
      </ion-item>
      <ion-item>
        <ion-radio [value]="id2">Voice 2</ion-radio>
      </ion-item>
    </ion-item-group>
  </ion-list>
</ion-radio-group>

Expected behavior

I have a radio group that contains two different lists, see:

This causes the radius on the ion-item-group to not be applied

Actual behavior

I would expect it to look like this (where i removed the radio group):

Relevant logs

[rdlabo]

Thank you for reporting this and for providing a concise reproduction—it made the issue straightforward to identify. Fixes are now open for both themes in #131 and rdlabo-dev/ionic-theme-md3#36. After verification is complete, I plan to release updated versions of both packages within a few days.