System hides an option to flag Very Low Quality in few cases, namely when post is:
Because of that users who already flagged it when none of above conditions applied miss an option to retract their flag.
Suggest1 to show this flag option to such users so that they could retract a flag.
1 Frankly I won't mind if this gets status-declined because I doubt that it is important. This is posted mainly to document how system behaves and to provide reference for those who may wonder why they can't retract flag in some cases.