Steps to reproduce:

1. Get the SET dialog box with four choices when opening the page to edit.
2. Go 'back' (via browser) to Read mode.
3. But I still have to answer the dialog box:

This is somewhat related to T130168: VisualEditor "Editing tabs" dialog should be easy to dismiss. (The Escape key closes the dialog box in both Read and Edit modes for me; this is an improvement compared to about a month ago. Just clicking outside the box still doesn't work, though.)