It looks like links to questions within quotes are being rendered with the question title in the edit mode preview, but as a URL in normal viewing.
Given the following question Markdown:
Testing some link formatting:
https://meta.stackexchange.com/questions/70710/what-are-tag-synonyms-and-merged-tags-how-do-they-work
"https://meta.stackexchange.com/questions/70710/what-are-tag-synonyms-and-merged-tags-how-do-they-work"
The following images show the difference in rendering between edit mode & view mode:
Question view:
Edit preview:
Current live rendering:
(Actual live rendering, not an image. This can be used to view the current behavior, including the discrepancy.)
Testing some link formatting:
What are tag synonyms and merged tags? How do they work?
"https://meta.stackexchange.com/questions/70710/what-are-tag-synonyms-and-merged-tags-how-do-they-work"
There are other past issues about link rendering discrepancies, but none of them seem to be quite this issue: