It often occurs to me to add an edit summary to a question-edit immediately after submitting the edit, especially if the changes aren't obvious (formatting etc.). So I:
- Click "edit" again.
- Fill in the summary
- Click on "Save Edits".
The 'edit' (no actual change has been made to the title/body/tags) is accepted, but the summary doesn't show up, i.e. it is silently rejected.
I don't think it should work this way because the summary has been added by the original editor within the original edit's edit-window. In fact if I remember correctly, it to used to work as expected earlier; so perhaps this is a recent change.