The side bar block shows incorrect content when it appears in a context outside the course where the block instance was created.

For example, add a side bar block to the front page and set it to be visible "throughout the entire site". In this case, it is displayed in particular in individual courses. However, in this situation it doesn't display the same contents as on the front page, but typically show as empty.

Steps to reproduce:

• Go to the front page and turn editing on
• Add a "side bar" block and set "Page contexts" to "Display throughout the entire site"
• Add a resource to the main menu block (e.g., a label)
• Go to a course (create one if needed)
• EXPECTED: Side bar block shows, and contains the same content as on the front page
• ACTUAL: Side bar block shows, but is shown as empty (or, sometimes, displays a random section from the course).