Error is being thrown when adding Jira issues dates to Team Calendar

Issue Summary

• An error is thrown when adding Jira issues' dates to a Confluence Calendar.

Steps to Reproduce

1. Create a new instance with just Jira and Confluence.
2. Create some Jira issues with a due date (just 1 issue will do);
3. Create a new Calendar in Confluence;
4. Click Add Event (Event type = Jira Issue Dates) > Name the event > Under "Display" just select Sprints

Expected Results

• Issues to be returned normally

Actual Results

• And error is thrown to the user:

  Error(s) occurred.

  Unable to load events of test (6e388a84-4aee-4b6a-a769-d6828ab1f8fa): com.atlassian.confluence.extra.calendar3.exception.CalendarException: calendar3.error.jiraresponse

Workaround

• As a workaround, you can remove the "Sprints" option (or the affected field) from being displayed, this would avoid this error from being thrown.