Calendar plugin displays shows versions across all projects even when using a single project filter to display issues

When using the Calendar plugin and an issue filter to display issues on the calendar, versions from all projects are displayed on the calendar.

If I have two projects and use a filter to display issues from one project on the calendar. I get version information from any project in JIRA, rather than just a single project used in the filter. This only happens when using the saved filters. If I select a single project it works correctly and the calendar only displays issues from a single project not all in the instance.
I'm listing this as a major loss of function as the customer noted that if you have a larger instance that makes strong use of version information then the Calendar becomes useless as it is so cluttered with information from projects that don't apply.

Original support case is https://support.atlassian.com/browse/JSP-51818

Steps to Reproduce

1. In JIRA 4.0.1 install the Calendar Plugin.
2. Create 2 or more projects, the more the better
3. Add several issues to each project 5-10
4. Create 2 or more versions in each project
5. Create a saved filter that shows issues from a single project
6. Add a JIRA Calendar Gadget to the dashboard
7. Configure the gadget to display issues from your saved filter.

Expected Result
Calendar Should ONly display issues/versions related to the saved filter.

What Happens
Calendar shows version information from all projects in the instance.