Windows Community Toolkit Gallery will Shake the ScrollBar at Left Strangely when Moving it with mouse

### Describe the bug

https://github.com/user-attachments/assets/41f98901-ec32-4728-9741-c0663b35f2b4

### Steps to reproduce

```text
As what the video did
```

### Expected behavior

Bar not shaking

### Screenshots

_No response_

### 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 damit, das im verlinkten Video gezeigte Verhalten der Bildlaufleiste in der Windows Community Toolkit Gallery unter UWP mit Windows 11 23H2 zu reproduzieren. Suche dann die Gallery-Ansicht und deren scrollbar-bezogenen Einstiegspunkt; fertig ist die Aufgabe, wenn die Bildlaufleiste beim Verschieben nach links mit der Maus nicht mehr zittert.

Vom Indexierungsmodell aus dem Issue-Text verfasst.