Search KB articles in customer portal (with Confluence DC integrated) causes duplicate search result entries to be rendered without body text

Issue statement

Search KB articles in customer portal (with Confluence DC integrated) causes duplicate search result entries to be rendered without body text.

Environment

• Replicable on Jira Service Management (JSM) Data Center with Confluence Data Center
• Issue not replicable on JSM 5.10.x.
• Issue was introduced with the JSM version 5.11.0

Steps to Reproduce

1. Create a Confluence DC instance (of version 8.5 or above)
2. Create app links between the JSM & the Confluence DC instances
3. In one JSM project, enable KB integration against the Confluence DC instance (linking to a new KB space)
4. Create a few sample articles in the new KB space in Confluence, e.g.
   1. 'Test article 1' with some sample body content
   2. 'Test article 2' with some sample body content
5. Go to help center page (or portal landing page) of the customer portal
6. Type 'test' in the search input

Expected Results

No duplicate search result entry should be rendered.

Actual Results

Duplicate search result entries are rendered, without body part.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available