Applying a template to `BreadcrumbItem` using style works differently then setting template directly

### Describe the bug

When a control template is applied to `BreadcrumbBarItem` using style WinUI cannot initialize it failing on finding deferred element by name, while it works fine if control template inlined or set using static resource.

### Steps to reproduce the bug

Use reproduction project [BreadcrumbTemplateRepro.zip](https://github.com/user-attachments/files/17646048/BreadcrumbTemplateRepro.zip)
Notice that if you extract the template and put it inline, project will run without any issues

### Expected behavior

Template initialization works consistently in all cases: inline, static resource, within a style

### Screenshots

_No response_

### NuGet package version

WinUI 3 - Windows App SDK 1.6.1: 1.6.240923002

### Windows version

Windows 11 (22H2): Build 22621

### Additional context

_No response_

Start with the attached BreadcrumbTemplateRepro.zip and reproduce the failure on Windows App SDK 1.6.1. Compare BreadcrumbBarItem template initialization when the template is inline, a static resource, and supplied through a style, focusing on the deferred-element-by-name failure. Done means all three forms initialize consistently without the reported error.

Written by the indexing model from the issue text.