Exposed filter as a block does not keep contextual filter parameters

Problem/Motivation

When contextual filters exist and the filter is exposed as a block, the search does not keep the contextual filter parameters(s).

Steps to reproduce

Pre-requisite:

• Install the Group module ( https://www.drupal.org/project/group → )
• Create a group
• Assign users to the group

Create a View with exposed filters:

• Create a View for Users
• Under "Advanced" for the view, add "Relationship: User group relationship" - Group membership and select "Require this relationship"
• Add a contextual filter for "Group relationship: Parent group"
• For Exposed form in block, select No
• Add some Fields to the view, such as username
• Add some exposed Filter Criteria and expose them: such as username
• For the view Page path: assign the path with the group ID as part of the URL: "group/%group/people"
• Save the view

Execute the search:

• On the search page, search for some username.
• Notice that the URL retains the group ID, something like: https:///group/4/people?, where "4" is the group id.
• Now go back to edit the View, and change "Exposed form in block" to Yes
• Go to Block Layout and add the exposed filter block to the appropriate page/group. Save the block layout.
• Search for some username again.
• Note that the URL, when executing the search, did not keep the group ID (the contextual filter param). URL looks something like this: https://anxdevwks-41.ds.annex.peratondev.lab/group/all/people?

Workaround

Do not expose the filter as a block if contextual filters exists.