Can't access Issue detail from self-hosted gitlab

Summary

I can access the list of 'Issues assigned to me', but when I click on one of those issue they just display "Fetching issuable details and discussions. This may take a while."

Steps to reproduce

1. update to 3.9.0
2. access self-hosted gitlab service
3. click on issue
4. bug appeared

What is the current bug behavior?

Issue Embedded view displaying "Fetching issuable details and discussions. This may take a while." forever

What is the expected correct behavior?

the View of the Issue (also it works fine in 3.8.0)

Relevant logs and/or screenshots

attached the suspicious stacktrace in devtool 1610604882085.log

Possible fixes

in src\gitlab\gitlab_new_service.ts:160

const getProjectPath = (issuable: RestIssuable) => issuable.references.full.split(/[#!]/)[0];