Activity Stream shows linking to issues that the user doesn't have access to

We have two groups of users, and two permission schemes with different groupings of projects. A User in group A can only view projects with Permission Scheme A. A user in Group B can only view projects with Permission Scheme B.

If I (belonging to both permission schemes) link an issue in a project from Permission Scheme A (we'll call this projectA), to an issue in a project assigned to Permission Scheme B (we'll call this project B), a user solely in one of those permission schemes does not see the link on the View Issue page. However, they do see a note saying "Bridget M changed the Link to 'This issue depends on PROJECTB-14' on PROJECTA-157 (Create Bug Lookup Tool)" in their activity stream. I would imagine that because they can't see it on the issue face, they shouldn't see it in the activity stream either.

Also, I want to bring up, for the (JRA-2364) issue, this is one of the areas that shows time tracking information still, despite the hack. If I knew how to block the time tracking stuff, I could hack our source files again to accommodate the time tracking changes.