Issue labels are wrongly applied to restrict KB search from the KB panel in the issue view

Steps to Reproduce

1. Link SD and Confluence instances
2. Create a service desk project.
3. Link a Confluence space to the SD project (e.g. use the Demonstration Space)
4. Create an issue in the service desk project having a summary that matches a Confluence page name (as the summary is used by the KB panel to run a Confluence page search to find KB articles). The KB panel should show a related article (at least) being the Confluence page mentioned previously.
5. Apply a label on the current issue that isn't on any Confluence page of the KB space, "unexisting-label" for example

Expected results

JIRA issue labels shouldn't affect the Confluence pages returned in the KB panel, so applying any labels shouldn't affect the related articles list there (indeed, labels configured in the "Auto-search on request forms" section of the KB settings page should only restrict Confluence page search using the configured labels in the customer portal on request type form pages KB suggestions (and filtering out pages not having the configured labels) and nowhere else)

Actual results

The JIRA issue labels are used in the KB search and make the panel related articles list being empty, same for the the KB panel search feature.

Workaround

Temporarily removing issue labels filtering out expected Confluence pages result should fix KB panel search.