SetDynamicResource does not update the Background property of the Label

### Description

A Label control is initialized with a transparent background in XAML. During the Loaded event, a DynamicResource is programmatically applied to the label's BackgroundProperty using SetDynamicResource.

Although the resource key resolves to a valid color resource (Red), the label background remains Transparent at runtime instead of updating to Red.

### Steps to Reproduce

1. Define a color resource in ContentPage.Resources.
2. Create a Label with Background="Transparent".
3. In the Loaded event, call SetDynamicResource on the label's background property using the resource key.
4. Run the application.

I have attached the reproducible sample. Kindly check the issue in the sample.

[CustomSample.zip](https://github.com/user-attachments/files/31137955/CustomSample.zip)

**Expected behavior:**
After the Loaded event executes, the backgroundColor resource should be resolved and applied to the label's background. The label background should change from Transparent to Red.

**Actual behavior:**
The SetDynamicResource call completes successfully, but the label background remains Transparent.

### Link to public reproduction project repository

_No response_

### Version with bug

10.0.90

### Is this a regression from previous behavior?

Not sure, did not test other versions

### Last version that worked well

Unknown/Other

### Affected platforms

Android, Windows, macOS, iOS

### Affected platform versions

_No response_

### Did you find any workaround?

_No response_

### Relevant log output

```shell

```

Start by running the attached CustomSample.zip reproduction and inspect the Label's Loaded event, where SetDynamicResource is called for BackgroundProperty. Compare the runtime background with the expected Red resource value; done means the Label changes from Transparent to Red after Loaded on the affected platforms.

Written by the indexing model from the issue text.