_tagGroupStates in MDG

[adepreter]

I have grouped tags in 2 MDGs as described here:
http://sparxsystems.com/enterprise_architect_user_guide/12.1/building_models/define_tag_groupings.html

The grouping works fine but the resulting behaviour of the _tagGroupStates is random. When we click on any element, the groups open or closed do not comply with the specification of the _tagGroupStates in our MDGs.

Is there any workaround?

Thanks

Alain