The code change, part of Platform Update 9 release, will allow for a selection of a new option in Workflow Parameters form to consider explicitly assigned users to be selected in Workflow security steps.
That option, when selected, will include the following users in the security role selection:
1- the users explicitly assigned to a legal entity
2- the users assigned to all legal entities
The default behavior remains as it is today with selection of users being not filtered by Legal Entity assignments.