albrecht
I have a subscription on * on my wiki.
I worked on a page, that containes links to other wiki pages. I clicked these links and opened the source to copy it to the clipboard and left the text unchanged. On closing the pages, the question "Stay on Page" popped up - but nothing has been modified; only text selection.
Short time later, I got a subscription email, that informed me, that these pages had been modified, but "Recent changes" didn't know about these changes.
On the other hand: the page, that has really been changed, has not been mentioned in the subscription.