I don't know if this is the same problem, but it seems like there is no way to claim tasks assigned to group because you can't retrieve them to your inbox. You can now only see tasks where either you are assignee or someone involved and tasks assigned to group have none of those fields populated.
I found that in tasks.js
<javascript>
if ($scope.account && $scope.account.groups && $scope.account.groups.length > 0) {
for (var i=0; i < $scope.account.groups.length; i++) {
if ($scope.account.groups.type == 1) {
$scope.model.assignmentOptions.push({ id: 'group_' + $scope.account.groups.id, title: $translate.instant('TASK.FILTER.ASSIGNMENT-GROUP', $scope.account.groups) });
}
}
}
</javascript>
But this additional filter doesn't show up if you assign task to a group you are member of.
It looks like this condition checking group type always returns false, because there is no type property returned. I have commented that condition for now (group of type==1) and 4th filter showed up.