hello.
this is about husk option and metadata in the rendered EXR file.

When a EXR image is rendered with husk with "exrmode=0" ,
the rendered image ignores the added metadata defined in "renderProduct" node.

# Fail to insert metadata when exrmode=0
dnhusk -s /Render/rendersettings2 -f 1001 -R HdPrmanLoaderRendererPlugin --purpose geometry,render --exrmode 0 --output ./exr_raster_fail.exr ./01_usd_raster.usda

# Okay to insert metadata when not using exrmode
dnhusk -s /Render/rendersettings2 -f 1001 -R HdPrmanLoaderRendererPlugin --purpose geometry,render --output ./exr_raster_okay.exr ./01_usd_raster.usda

When using legacy .exr files (exrmode=0), the metadata support isn't as complete as when storing multi-part images.
This is a known issue with the legacy OpenEXR driver, but submitting a bug/RFE would be helpful.