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Issue number: resolves #28417
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## What is the current behavior?
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The common `IonRouterOutlet` was trying to inject another common
`IonRouterOutlet` into `parentOutlet`:
dc94ae01fe/packages/angular/common/src/directives/navigation/router-outlet.ts (L119)
None existed, so this field was `null`.
This is a problem if developers are using the module `IonRouterOutlet`
since parent router outlets will not be currently injected because
Angular is trying to use the common `IonRouterOutlet` not the module
`IonRouterOutlet`:
https://github.com/ionic-team/ionic-framework/blob/main/packages/angular/src/directives/navigation/ion-router-outlet.ts.
The same goes for the standalone `IonRouterOutlet`.
This resulted in things such as `NavController.pop` not working in
nested outlets because the parentOutlet was not defined.
## What is the new behavior?
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this PR. -->
- `IonRouterOutlet` now injects the correct router outlet instance for
`parentOutlet`
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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and migration path for existing applications below. -->
## Other information
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screenshots of how the component looks before and after the change. -->
Dev build: `7.5.3-dev.11698328998.1a79f815`