Link Text name of a Space changes into the Space key if viewed by a user without Space view permission for that specific Space.

Steps to reproduce

1. Create a Space (e.g.: Space name "TEST 1 - 3" with Space key "TES") with a Homepage that has the same name as the Space name
2. In other public Space, create a Page, and insert a link to Space (point to the Space NOT the Space Homepage) "TEST 1 - 3" without changing the Link Text, then save the page
3. The link name will be "TEST 1 - 3"
4. Login to Confluence using another user that doesn't have Space view permission to "TEST 1 - 3"
5. When viewing the page created earlier, the link text changed to "TES" instead of "TEST 1 - 3"