Bookmark save in "Tasks" silently fails

Problem:
We are unable to save or see bookmarks in “Tasks”.

Expected outcome:
Seeing and saving bookmarks is successful.

Foreman and Proxy versions:
1.21.3/1.21.3

Foreman and Proxy plugin versions:
Bastion 6.1.16
Foreman-tasks 0.14.5
Foreman_remote_execution 1.7.0
Foreman_templates 6.0.3
Katello 3.11.1

Other relevant data:

logs
production.log
2019-05-07T11:32:45 [I|app|2753a009] Current user set to XXXXXXXXX (admin)
2019-05-07T11:32:45 [I|app|2753a009] Completed 200 OK in 7ms (Views: 0.1ms | ActiveRecord: 1.1ms)
2019-05-07T11:32:50 [I|app|2c3b38e8] Started POST "/api/bookmarks" for 10.8.50.101 at 2019-05-07 11:32:50 -0700
2019-05-07T11:32:50 [I|app|2c3b38e8] Processing by Api::V2::BookmarksController#create as JSON
2019-05-07T11:32:50 [I|app|2c3b38e8]   Parameters: {"name"=>"Running-Tasks", "query"=>"state = running", "public"=>true, "apiv"=>"v2", "bookmark"=>{"name"=>"Running-Tasks", "query"=>"state = running", "controller"=>"api/v2/bookmarks", "public"=>true}}
2019-05-07T11:32:50 [I|app|2c3b38e8] Current user set to XXXXXXXXX (admin)
2019-05-07T11:32:50 [E|app|2c3b38e8] Unprocessable entity Bookmark (id: new):
  Controller /foreman_tasks/tasks is not a valid controller

2019-05-07T11:32:50 [I|app|2c3b38e8]   Rendering api/v2/errors/unprocessable_entity.json.rabl within api/v2/layouts/error_layout
2019-05-07T11:32:50 [I|app|2c3b38e8]   Rendered api/v2/errors/unprocessable_entity.json.rabl within api/v2/layouts/error_layout (0.7ms)
2019-05-07T11:32:50 [I|app|2c3b38e8] Completed 422 Unprocessable Entity in 12ms (Views: 1.3ms | ActiveRecord: 1.6ms)

@iNecas is this the same issue as Bug #25976: bookmarks and autocompletion don't work for nested controller - Foreman which you fixed for 1.22?