Some `ui.scene` demos are killed when scrolling to the bottom of the page

[falkoschindler]

First Check

• I added a very descriptive title here.
• This is not a Q&A. I am sure something is wrong with NiceGUI or its documentation.
• I used the GitHub search to find a similar issue and came up empty.

Description

1. Navigate to https://nicegui.io/documentation/scene.
2. Scroll to the bottom.
3. Scroll back to the top.

The first demo stopped rendering, displays a sad face instead and JavaScript says "WARNING: Too many active WebGL contexts. Oldest context will be lost."

Note: The reproduction might depend on PR #5344 and/or PR #5349 being deployed because they add additional demos which exceed the limit.

NiceGUI Version

3.1.0

Python Version

3.11

Browser

Chrome

Operating System

macOS