GetFeatureInfo: dimensions values are not passed to WMS source

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I want to forward a GetFeatureInfo to a WMS source through a MapCache WMTS service. That WMS source has a dimension and the MapCache tileset linked to it defines that dimension as well.

When I send a WMTS request with dimension, e.g.:

curl "http://localhost/mapcache/wmts?REQUEST=GetFeatureInfo&...&foo=bar"

I observe that the URL sent to WMS source is:

"http://remotehost/wms?REQUEST=GetFeatureInfo&...&foo=&dim_foo="

with no dimension value at all. I expect something like:

"http://remotehost/wms?REQUEST=GetFeatureInfo&...&foo=bar&dim_foo=bar"

Digging the code, I find in source_wms.c that the dimension value passed to WMS source uses rdim->cached_value field. When I replace it with rdim->requested_value, I get correct dimension values in the URL sent to WMS source.