Solution to issue cannot be found in the documentation.

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Issue

License metadata is not included for all outputs from this recipe.

As illustration, nbconvert-core does include the license info in package metadata:

mamba repoquery search nbconvert-core=6.5.3=pyhd8ed1ab_0 --json

...
                "fn": "nbconvert-core-6.5.3-pyhd8ed1ab_0.tar.bz2",
                "license": "BSD-3-Clause",
                "md5": "9dfdb5f2271cb67d81b152194a6254db",
                "name": "nbconvert-core",
...

Whereas nbconvert-pandoc does not:

mamba repoquery search nbconvert-pandoc=6.5.3=pyhd8ed1ab_0 --json

...
                "fn": "nbconvert-pandoc-6.5.3-pyhd8ed1ab_0.tar.bz2",
                "license": "",
                "md5": "8ecb7e0ac01613b3e186b1778f6049fb",
                "name": "nbconvert-pandoc",
...

The rule looks like any ouput which defines its own metadata in a dedicated about section will overload the main about metadata.
nbconvert and nbconvert-core does include license info, whereas nbconvert-webpdf, nbconvert-pandoc and nbconvert-all does not.

Installed packages

Not relevant as this is a packaging issue, not a bug with nbconvert.

Environment info

Not relevant as this is a packaging issue, not a bug with nbconvert.