In Jira Plans Field with User Dropdown does not get group restriction from Space field config

[Gary Smith]

In Jira plans I have added a field column where the field is a user pick list. In the Space, I have a field configuration to restrict the users shown for this field on create and edit screens to members of a group. However in the plan when I click on the  field for the drop down of possible values, it very briefly shows the correct filtered list before going to a wider list of users not in the group filter I configured in the field configuration