Task Inbox - Skippable and GroupId columns are not listed

After user specifies an advanced filter in Task inbox on task field 'name', there's extended list of available columns to be enabled.
Between 7.2 and 7.3 there's been a change that I can't track against any other issue between now and then.

In 7.3 the columns Skippable and GroupId are not anymore among the available columns.

I am marking this as regression, unless we can track the change in another issue targeted against 7.3.