Specifying plugins to local_costmap.yaml causes it to disappear

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As an additional feature to my navigation stack, I'd like to add social_navigation_layers (http://wiki.ros.org/social_navigation...) to my local costmap, to distinguish between obstacles and humans. This should add extra inflation to the local costmap, such that my teb local planner better can navigate in the environment. For this I'm trying to specify layers of both the global and local costmap in the form of plugins as specified by this tutorial: http://wiki.ros.org/costmap_2d/Tutori....

The problem I'm facing is, that when specifying any plugin (including default) for my local costmap, the local costmap disappears from RViz and the topic /move_base/local_costmap/costmap returns only zero's. This ruins my navigation. If I comment out all plugins in the local costmap then everything works fine, besides that the social_navigation_layers won't be used. Specifying any and all plugins for the global costmap, then this seems to work fine. Using 'rosparam get' I can see, that the plugins are used for both the local and global costmap, despite it not working for the local costmap. If I do not specify any plugins for the local costmap then pre-Hydro parameters will be used, indicated by a warning in the terminal

Currently I'm running Melodic (Ubuntu 18.04), but I've also tested this on Kinetic (Ubuntu 16.04) with the same issue.

Picture of missing costmap. The small curved green line represents parts of an obstacle detected by the laser scanner and shown through teb markers.

UPDATE 1: Added .yaml files, and warning with pre-Hydro parameters.

UPDATE 2: Changed local_costmap.yaml to the way I want them to be, added output of 'rosparam get' and picture of missing costmap from RViz.

costmap_common.yaml

# Common settings for costmaps
# May be overwritten in specific global and local costmap files


# Robot Footprint Parameters
#footprint: [[0.55,0.5],[0.55,-0.5],[-0.55,-0.5],[-0.55,0.5]]   #Square robot
#footprint_padding: 0.01
robot_radius: 0.55    # Circular robot
# inflation_radius: 0.35


# Global Filtering Parameters
obstacle_range: 7   
raytrace_range: 4.0

costmap_global.yaml

global_costmap: 
  # Coordinate frame and tf parameters
  global_frame: map         # Test with /map as per documentation
  robot_base_frame: base_link
  transform_tolerance: 1.5  

  # Rate parameters
  update_frequency: 0.5     
  # publish_frequency: 1.0    

  # Map management parameters
  rolling_window: false
  static_map: true


  plugins:
    - {name: static_layer,         type: "costmap_2d::StaticLayer"}
    - {name: obstacles_layer,      type: "costmap_2d::VoxelLayer"}
    - {name: inflation_layer,      type: "costmap_2d::InflationLayer"}

  # Layer Definitions
  static_layer:
    map_topic: /map
    subscribe_to_updates: true

  inflation_layer:
    # cost_scaling_factor: 10.0 # Default: 10.0
    inflation_radius: 0.5

costmap_local.yaml

local_costmap: 
  # Coordinate frame and tf parameters
  global_frame: odom
  robot_base_frame: base_link
  transform_tolerance: 1.0  

  # Rate parameters
  update_frequency: 10.0    
  publish_frequency: 10.0   


  # Map management parameters
  static_map: false
  rolling_window: true      
  width: 10                 # The width of the map in meters. Default: 10
  height: 10                # The height of the map in meters. Default: 10
  resolution: 0.05          # The resolution of the map in meters/cell. Default: 0.05


  plugins:
    - {name: obstacles_layer,          type: "costmap_2d::ObstacleLayer"}
    - {name: inflation_layer,          type: "costmap_2d::InflationLayer"}
    - {name: social_layer,             type: "social_navigation_layers::ProxemicLayer"}
    - {name: social_pass_layer,        type: "social_navigation_layers::PassingLayer ...