I followed a question, then started editing it. After I saved the edits, it returned to the post (as usual) but I noticed that the text of the Follow button has been reset to "Follow" instead of "Following". I thought maybe I hadn't actually followed it but upon refreshing the page, the button said "Following" as it did prior to the edit.
I initially assumed that for this to happen, you have to start editing the post before refreshing the page. Turns out, that doesn't matter. The text will be reset even if the post has already been followed before you open the Q&A page.
This most likely only happens with the inline editor (i.e., you must have 2k+ rep to test this).