The scrollbar thumb on the Minecraft "Play" screen changes size inconsistently during scrolling.

Partner Rank: Medium

Verification Builds: 1.21.22 / 27262419

Regression Builds: Unknown

Summary: The scrollbar thumb on the "Play" screen changes size inconsistently during scrolling.

Affects currently Live Content: No

Impact: The scrollbar thumb changes size while scrolling, creating a disorienting experience for users and affecting usability.

Repro Steps:

1. Open the "Play" screen.
2. Begin scrolling through the list.
3. Observe the behavior of the scrollbar thumb.

Observed Results: The scrollbar thumb size changes inconsistently as the user scrolls. See video for an example.

Expected Results: The scrollbar thumb should maintain a consistent size throughout the scrolling action.

Screenshots/Videos attached: Yes https://www.dropbox.com/t/dpWdd7JEqP21Q1A9 

Notes: