Pull request link in organization project is broken

[PaulBol]

Description

I have set up a project for the organization that's accessible at a URL like https://gitea.myorg.com/myorg/-/projects/1.

The boards show issues with links to pull request, if applicable.

These links have the form https://gitea.myorg.com/pulls/456 and don't work. The correct link would be https://gitea.myorg.com/myorg/repo1/pulls/456

I am not able to reproduce the issue on try.gitea.io because I can't set up an organization.

Gitea Version

1.20.0

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

Highlighted link goes to https://gitea.myorg.com/pulls/456 (status 404 page) instead of https://gitea.myorg.com/myorg/repo1/pulls/456

Git Version

No response

Operating System

Linux

How are you running Gitea?

Official build running with systemd. I doubt that this matters of the link, though.

Database

MySQL

[delvh]

Duplicate of both #25954 and #23318.