[MapProxy] All black tiles when reprojecting from webmercator to geodetic

[Eric Reichwaldt]

When following the example configuration and guide for reprojecting tiles,
I get a map full of all black tiles. If I add the webmercator grid to the
borders_cache section, I can see on the demo site that the tiles are being
loaded properly. Any ideas?

services:
  demo:
  tms:
    use_grid_names: true
  wms:
    md:
      title: MapProxy WMS Proxy
      abstract: This is a minimal MapProxy example.

layers:
  - name: Borders
    title: Border overlay
    sources: [borders_cache]

sources:
  shyft_borders_gtile:
    type: tile
    grid: GLOBAL_WEBMERCATOR
    url:
http://192.168.1.217:8008/WMS?FORMAT=image/png&CRS=EPSG:3857&LAYER=Borders&REQUEST=GetGTile&SERVICE=WMS&TRANSPARENT=TRUE&VERSION=1.3.0&TILEZOOM=%(z)s&TILECOL=%(x)s&TILEROW=%(y)s
    transparent: true

caches:
  borders_cache:
     grids: [GLOBAL_GEODETIC]
     meta_size: [4, 4]
     sources: [borders_in]

  borders_in:
     sources: [shyft_borders_gtile]
     grids: [GLOBAL_WEBMERCATOR]
     disable_storage: true

globals:
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