steps to reproduce

Run fiddle
http://zkfiddle.org/sample/37humbf/1-ArrayGroupModel-not-sync-with-meshcomponent

effect 1: group require 2 clicks to open.

from a fresh page (F5):
-Click on the "toggle open close" button (groups are all closing)
-Click on a group label to open it.

effect 2: closed group stay closed even when opened from server side.

from a fresh page (F5):
-manually close a group by clicking it.
-use the "toggle open close button" twice.

actual result

effect 1:

group doesn't open, but group status (triangle icon) switches to closed. One more click will open the group.

effect 2:

other groups are opening. Closed group stay closed.

expected result

effect 1:

group should already display as closed. One click on the group should open it if set closed from server side.

effect 2:

all groups set opened from server side should open on client side

debug info

Same effect with GroupsModelArray and SimpleGroupsModel

root cause

Workaround