Link to create merge request at contributing files don't work for contributors

At https://gitlab.eclipse.org/eclipse/escet/escet/-/blob/develop/CONTRIBUTING.asciidoc we have the contributing file for Eclipse ESCET. For not logged in users it looks like this:

The text "After you've reviewed these contribution guidelines, you'll be all set to contribute to this project." appears to be provided by GitLab itself.

For those who are logged in, it looks something like this:

The GitLab-provided text has changed to "After you've reviewed these contribution guidelines, you'll be all set to submit an issue or create a merge request.".

The 'create a merge request' link links to https://gitlab.eclipse.org/eclipse/escet/escet/-/merge_requests/new. As a logged in committer, this link works fine. As a logged in contributor, this leads to a 404.