When your preferences are configured to receive email notifications for a new edit to pages on your watchlist, and a bot edits one such page, no email notification is sent for that edit, or for any subsequent edit to that page, meaning if you primarily use enotifs as a watchlist instead of Special:Watchlist, you can miss edits to pages for an arbitrary amount of time.
This *may* be a dupe of bug 27884, but I'm filing it as a separate bug in case it isn't
Version: 1.21.x
Severity: normal