Which @angular/* package(s) are the source of the bug?

core

Is this a regression?

No

Description

The definition of the ng-template is wrongly removed after running ng generate @angular/core:control-flow in a specific scenario.

Before:

<div *ngIf="sampleVar else sampleTemplate">
  <ng-container *ngTemplateOutlet="sampleTemplate; context: {
                  value: 'sampleVar is true'
  }">
  </ng-container>
</div>

<ng-template #sampleTemplate let-value="value">
  <h1>{{ value ?? "sampleVar is false" }}</h1>
</ng-template>

After (see the definition of sampleTemplate has been removed even though it is still being used):

@if (sampleVar) {
  <div>
  <ng-container *ngTemplateOutlet="sampleTemplate; context: {
                  value: 'sampleVar is true'
  }">
    </ng-container>
  </div>
} @else {
  <h1>{{ value ?? "sampleVar is false" }}</h1>
}

Please provide a link to a minimal reproduction of the bug

https://github.com/lukasmatta/control-flow-migration-issue

Please provide the exception or error you saw

Please provide the environment you discovered this bug in (run ng version)

Anything else?

No response