How to update pull request created with "Suggest improvements"?

[Marcono1234]

When you use the "Suggest improvements for this vulnerability" link of an advisory (bottom right corner), it automatically creates a pull request here in this repository.

The problem is that it does not actually create a fork for your account, instead it creates the source branch of the PR within this repository here. It seems that makes it impossible to fix any mistakes you made (e.g. trailing whitespace for version numbers, or typos)¹, and requires you to open another pull request or manually fork the repository.

Or is there some way to update these PRs?

Footnotes

1. Some of those might only be obvious in the Git diff of the PR, and not within the improvement dialog. ↩