TYPO3 Core

Not sure if this is a bug or missing feature or just an inconvenience.

• New, empty TYPO3 v13.3 site.
• Create a page and a site (Site Management => Sites), e.g. example.
• Install an extension that provides a Site Set (e.g. foobar/extension1).
• Go to Site Management => Sites and select the site.
• Open tab General and locate Sets for this Site at the bottom. Select the Site Set foobar/extension1.
• Save the configuration
• Delete the extension foobar/extension1.
• Go to Site Management => Settings

The site example still shows the dependency foobar/extension1 which doesn't exist anymore.
The deleted Site Set still exists in the site configuration: config/sites/example/config.yaml.