Cannot pick Confluence pages from the suggestion list in new issue view

Issue Summary

When using the Link Confluence Pages feature on JIRA issues, it usually allows us to start typing the page name and suggests a list of pages that match with what we are typing. Though, if we are in the new issue view and try to pick one of the suggested pages, JIRA throws us an error saying to check our connection.

Steps to Reproduce

1. Make sure to get the new issue view enabled;
2. Go to a JIRA issue and use the feature to link a Confluence page;
3. Click over one of the suggested pages;
4. Click over the Link button*

Expected Results

The Confluence page is linked to the issue.

Actual Results

JIRA throws us an error saying We're having trouble. Check your connection and try again.

Notes:

• After clicking in the Link button, a 400 error is generated with response {"errorMessages":[],"errors":{"pageUrl":"addconfluencelink.error.url.invalid"}}

Workaround

You can either disable the new issue view or paste the Confluence page URL directly in the field.