TokenizingTextBox will Delete More Tokens Than Expected when Some Tokens Have Same Content

### Describe the bug

Tokens with same content will be deleted when other tokens with same contents deleted by using backspace key. **Plus, only the tokens in TokenizingSample have this problem.**

### Steps to reproduce

```text
1. Create tokens like Pic 1 below.
2. select a token having same content with at least one token.(In the picture, we select "Account")
3. Press backspace, all tokens with same content will be deleted.
P.S.: if the token is not in TokenizingSample, the bug won't be reproduced, Pic 2 below is an Example.
```

### Expected behavior

Only selected token will be deleted.

### Screenshots


Pic 1


Pic 2

### Code Platform

- [X] UWP
- [ ] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 10 21H2 (Build 19044)
- [ ] Windows 10 22H2 (Build 19045)
- [ ] Windows 11 21H2 (Build 22000)
- [X] Other (specify)

### Other Windows Build number

Windows 11 23H2 (Build 22635.3139)

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Windows 10, version 2104 (Build 20348)
- [ ] Windows 11, version 22H2 (Build 22000)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

_No response_

### Help us help you

No, I'm unable to contribute a solution.

Beginne mit dem TokenizingTextBox-Steuerelement und dem TokenizingSample und reproduziere dann das Problem, indem du Tokens mit doppeltem Inhalt erstellst und bei einem davon Backspace drückst. Erledigt ist es, wenn in TokenizingSample nur das ausgewählte Token gelöscht wird, während Tokens mit demselben Inhalt erhalten bleiben.

Vom Indexierungsmodell aus dem Issue-Text verfasst.