Web IDE doesn't work in repo's in subgroups

Summary

Web IDE doesn't work in repo's in subgroups because of a 404 Api call.

Steps to reproduce

Open / start the Web IDE in any repo in a subgroup.

Example Project

https://gitlab.com/-/ide/project/yroot/docker/openssh-client/edit/master/ (https://gitlab.com/yroot/docker/openssh-client)

What is the current bug behavior?

The Web IDE starts a GET Api Request https://gitlab.com/api/v4/projects/yroot%2Fdocker but the repo path is incomplete.

What is the expected correct behavior?

The Web IDE should start a GET Api Request to https://gitlab.com/api/v4/projects/yroot%2Fdocker%2Fopenssh-client with a fixed path.

Relevant logs and/or screenshots

Not needed.

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

GitLab.com

Results of GitLab application Check

GitLab.com

Possible fixes

Adjust repo path. See What is the expected correct behavior?