[MapProxy] opacity not working?

[DeDuikertjes]

List,

I've the mapproxy config to my liking. Everything is working fine except 
for the opacity on a source.

I would expect a layer pointing to a cache pointing to a source with 
definition:
   wms_Bedrijventerrein:
     concurrent_requests: 4
     image: {opacity: 0.1}
     req: { layers: Bedrijventerrein, transparent: true, url: 
'http://myservice.nl/MapServer/WMSServer'}
     seed_only: false
     supported_srs: ['EPSG:28992']
     type: wms
     wms_opts: {featureinfo: true}
to be rendered almost transparent when requested and/ or merged on top 
of other layers.
The result is unfortunately fully opaque.

Can anyone point me to what I am doing wrong.

I've isolated the problem and tested it in the configuration attached below.

Any help greatly appreciated,
MArco

caches:
   _Bedrijventerrein:
     grids: [applas_grid]
     link_single_color_images: true
     sources: [wms_Bedrijventerrein]
   _lufo:
     cache: {directory_layout: tc, type: file}
     grids: [applas_grid]
     link_single_color_images: true
     meta_buffer: 0
     meta_size: [4, 4]
     minimize_meta_requests: true
     sources: [lufo_wms]
     format: image/png
     image:
       mode: RGBA
globals:
   cache:
     base_dir: /var/applas_user_data/prod/cache/
     lock_dir: /var/applas_user_data/prod/cache/locks/
     meta_buffer: 255
     meta_size: [3, 3]
     minimize_meta_requests: true
   image:
     formats:
       image/png:
         encoding_options: {quantizer: fastoctree}
         mode: P
         transparent: true
grids:
   applas_grid:
     bbox: [-285401.91999999998, 22598.080000000002, 595401.92000000004, 
903401.92000000004]
     res: [3440.6399999999999, 1720.3199999999999, 860.15999999999997, 
430.07999999999998,
       215.03999999999999, 107.52, 53.759999999999998, 
26.879999999999999, 13.44, 6.7199999999999998,
       3.3599999999999999, 1.6799999999999999, 0.83999999999999997, 
0.41999999999999998,
       0.20999999999999999]
     srs: EPSG:28992
     tile_size: [256, 256]
layers:
- name: lufo
   sources: [_lufo]
   title: Luchtfoto
- name: Bedrijventerrein
   sources: [_Bedrijventerrein]
   title: Bedrijventerrein
services:
   tms: null
   wms:
     image_formats: ['image/png']
     md:
       abstract: Tiled WMS
       access_constraints: None
       contact: {address: mystreet 1, city: Utrecht, country: The 
Netherlands, email: nope at spam.org,
         organization: nope, person: nope, phone: nope,
         position: Technical Director, postcode: nope}
       fees: None
       online_resource: http://myservice.nl/
       title: tile service.
     srs: ['EPSG:28992', 'EPSG:900913', 'EPSG:4326']
sources:
   lufo_wms:
     concurrent_requests: 4
     req: {layers: ipo_luchtfoto_actueel, url: 
'http://myservice.nl/mapserv.cgi?map=luchtfoto.map'}
     supported_srs: ['EPSG:28992']
     type: wms
   wms_Bedrijventerrein:
     concurrent_requests: 4
     image: {opacity: 0.1}
     req: { layers: Bedrijventerrein, transparent: true, url: 
'http://myservice.nl/MapServer/WMSServer'}
     seed_only: false
     supported_srs: ['EPSG:28992']
     type: wms
     wms_opts: {featureinfo: true}
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