.NET Core Minimal API string path pattern underline

Does anyone know what makes the “/about” string to be underlined in the above code?
It disappears when I disable code analysis, but there are no suggestions listed on what exactly the issue is.
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This underlining tells that this literal is interactable.

Ctrl + Clickshould perform navigation to declarations, but in your case/aboutis a single declaration itself, so no navigation will be performed.Here's example where
Ctrl + Clickdoes something meaningful.You can follow our documentation to review all your endpoints declarations in Endpoints Tool.
Thank you!
Regards,