Attempting to save leads to:

 | NoMethodError (undefined method `puppet?' for nil:NilClass):
 |   app/models/lookup_value.rb:32:in `value_present?'
 |   app/models/concerns/orchestration.rb:69:in `valid?'
 |   app/models/concerns/foreman/sti.rb:29:in `save_with_type'
 |   app/controllers/hosts_controller.rb:109:in `block in update'
 |   app/models/taxonomy.rb:76:in `block in no_taxonomy_scope'
 |   app/models/taxonomy.rb:83:in `block (2 levels) in as_taxonomy'
 |   app/models/concerns/foreman/thread_session.rb:147:in `as_location'
 |   app/models/taxonomy.rb:82:in `block in as_taxonomy'
 |   app/models/concerns/foreman/thread_session.rb:112:in `as_org'
 |   app/models/taxonomy.rb:81:in `as_taxonomy'
 |   app/models/taxonomy.rb:75:in `no_taxonomy_scope'
 |   app/controllers/hosts_controller.rb:106:in `update'
 |   app/controllers/concerns/application_shared.rb:13:in `set_timezone'
 |   app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
 |   lib/middleware/catch_json_parse_errors.rb:9:in `call'
 |

This is caused by the puppet default checkbox not being disabled for users without the edit_params permission.