Slack commands doesn't work if project alias has / sign

Summary

Slack commands doesn't work if project alias has / sign.

Steps to reproduce

Use the default steps to connect slack with gitlab. by default the project alias has / in the name e.g: group-name/project-name

current bug behavior?

expected correct behavior?

slashcommand should work properly

What alias works?

if we remove the / from the project alias in Settings > Integrations > Slack application or set an alias without special characters, the command works.