bug: backdrop not shown when IonDatetime is used in IonModal

[mattalco]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v8.x

Current Behavior

When IonDatetime is used within an IonModal, the backdrop that is supposed to accompany the date/time selector doesn't appear.

Expected Behavior

When IonDatetime is used within an IonModal, the backdrop as appears here in the docs appears correctly.

Steps to Reproduce

Create basic Ionic app
Create an IonModal
Inside that IonModal, place an IonDatetimeButton component
Within the element as the base IonModal, place the Basic Usage code provided here: https://ionicframework.com/docs/api/datetime-button

Code Reproduction URL

https://stackblitz.com/edit/jcadpz?file=src%2Fmain.tsx

Ionic Info

Ionic:

Ionic CLI : 7.2.0 (/Users//.npm-packages/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/react 8.1.2

Capacitor:

Capacitor CLI : 6.0.0
@capacitor/android : not installed
@capacitor/core : 6.0.0
@capacitor/ios : not installed

Utility:

cordova-res : not installed globally
native-run : 2.0.1

System:

NodeJS : v20.11.0 (/usr/local/bin/node)
npm : 10.2.4
OS : macOS Unknown

Additional Information

I feel like there needs to be some way for a modal associated with a datetime modal to have a higer z-index so the backdrop appears correctly. I tried supplying my own IonBackdrop but couldn't get that to work. I can manually edit the :host pseudo selector in the dev tools and increase the z-index to a value that works (11 vs. 2).

[thetaPC]

Thank you for submitting the issue!

Could you provide more context of why you would like a nested modal?

I would recommend using a popover instead. This provides the backdrop plus there won't be a need a secondary modal.

<IonPopover keepContentsMounted={true}>
  <IonDatetime id="datetime"></IonDatetime>
</IonPopover>
<IonModal isOpen={true}>
  <IonHeader>
    <IonToolbar>
      <IonTitle>Bug Demo</IonTitle>
    </IonToolbar>
  </IonHeader>
  <div
    style={{
      height: '100%',
      display: 'flex',
      alignContent: 'center',
      justifyContent: 'center',
    }}
  >
    <IonDatetimeButton datetime="datetime"></IonDatetimeButton>
  </div>
</IonModal>

[mattalco]

The popover does technically work but is an unsatisfactory user experience. I much prefer the larger tap space and centeredness of the modal style vs the popover.

For example, here is a modal dialog from my app.