A saved sidebar extension, when removed, still renders its panel when the pixiebrix sidebar is toggled off/on

[BLoe]

Steps to reproduce:

1. create a sidebar extension
2. save it
3. render the panel
4. remove the extension from page editor
5. close and re-open the pixiebrix sidebar
6. the removed panel renders again

Initial diagnosis:

In the sidebar content script, when a "dynamic" element is removed, both the extension and extensionPoint are removed. For some reason, with an installed extension, only the element is removed, and not the extensionPoint. See: sidebar.tsx

[twschiller]

This might be fixed by https://github.com/pixiebrix/pixiebrix-extension/pull/4108

[github-actions[bot]]

This issue will be closed in 7 days unless the stale label is removed, or a comment is added to the issue.

[github-actions[bot]]

This issue was closed because it has been stale for 7 days with no activity.