bug: Unable to choose preselected time through ion-datetime-button using minuteValue

### Prerequisites

- [x] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#creating-an-issue).
- [x] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [x] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already report this problem, without success.

### Ionic Framework Version

v8.x

### Current Behavior

When using `minuteValue` for `ion-datetime` and the current time does not match a valid time according to the `minuteValue`, the preselected time when opening the `ion-datetime` modal, does not emit a value. And the `ion-datetime-button` keeps showing the current (invalid) time.

Only by changing the time to something else, and then changing it back, will it emit the chosen value.


### Expected Behavior

I should be able to select the time the time picker has preselected.

### Steps to Reproduce

1. Use this template code

```html

```

2. Make sure the current time is not a valid value
3. Open the time picker
4. Click "done"
5. No value was selected or emitted, the time picker still shows the original time.

### Code Reproduction URL

https://stackblitz.com/edit/sgkfctaz-ahbwunyn?file=src%2Fapp%2Fexample.component.html

### Ionic Info

```
Ionic:

Ionic CLI : 7.2.0 (C:\Users\\AppData\Local\nvs\node\22.12.0\x64\node_modules\@ionic\cli)
Ionic Framework : @ionic/angular 8.4.2 (C:\Users\\Projects\\node_modules\@ionic\angular)
@angular-devkit/build-angular : 19.1.4 (C:\Users\\Projects\\node_modules\@angular-devkit\build-angular)
@angular-devkit/schematics : 19.1.4 (C:\Users\\Projects\\node_modules\@angular-devkit\schematics)
@angular/cli : 19.1.4 (C:\Users\\Projects\\node_modules\@angular\cli)
@ionic/angular-toolkit : 12.1.1 (C:\Users\\Projects\\node_modules\@ionic\angular-toolkit)

Capacitor:

Capacitor CLI : not installed
@capacitor/android : 6.2.0 (C:\Users\\Projects\\node_modules\@capacitor\android)
@capacitor/core : 6.2.0 (C:\Users\\Projects\\node_modules\@capacitor\core)
@capacitor/ios : 6.2.0 (C:\Users\\Projects\\node_modules\@capacitor\ios)

Utility:

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

System:

NodeJS : v22.12.0 (C:\Users\\AppData\Local\nvs\default\node.exe)
npm : 11.1.0
OS : Windows 10
```

### Additional Information

Related to https://github.com/ionic-team/ionic-framework/issues/30183