At a Map Widget on [Dashboard], Click a map type Map element and choose "Submap" on the popped up window.
Then the window swiches to [Monitoring] -> [Maps] not in the widget.

Abobe behaivier is dfferent from version 4.0.5.
Before that version, It displays  the submap  in the widget.

1. [Monitoring]>[Dashboard]>Map Widget
2. click map type element on the map.
3. choose Submap

Result:
a)4.0.5 or above.
Moved to [Monitoring]->[Maps]

b)4.0.4 or before.
Display the Submap in the widget.

I am sure the behaivior a) is bug or not.
However,I believe it caused by the effect of the following fixes.

ZBXNEXT-5046 added non-destructive resizing and reordering of
dashboard widgets (ashubin, gcalenko, miks)
ZBX-15512 fixed performance issues in "Problems by severity"
widget (talbergs)

I patched above fixes only to 4.0.4 and confirmed the behavior
is becoming same as 4.0.5 or above. submap is displayed in the
[Monitoring]->[Maps] window.

Is this change of behavior is a Bug? or menthined in some document ?