Fixes #5807. If the page instance being previewed gets saved (no confirmation that Wagtail itself is doing this, but it could easily happen as a result of some misplaced logic in
get_context or similar), it will block further page creations in a way that's difficult to recover from.
|Folder Totals (13 files)||87.22%|
|Project Totals (427 files)||90.05%|