It seems that while the title attribute for each question link on the front page of each SE does not include the spoiler text or pictures, the line breaks still are still present in the source code. This seems to be present on both graduated and beta sites.
This behavior is consistent on all of the filters on the front page:
SciFi.SE (with spoilers):
Anime.SE (with image):
The Search pages doesn't have this problem, because the title attribute text is the title question:
On the Unanswered and Question pages, there does not seem to any title tags on the the questions using any of the filters on each page.
This behavior seems to be a bit inconsistent when there are title attributes on the front and search pages. I not sure if this is intended or not, but it may be an accessibility issue (not describing where the link is going).