Inconsistent result when adding or not the `jdk_version` parameter

For the `graalvm` distribution, when doing a package query, the results are inconsistent if the `jdk_version` parameter is added:

* Requesting packages without a `jdk_version`:
* https://api.foojay.io/disco/v3.0/packages?distro=graalvm&operating_system=linux&directly_downloadable=true&latest=available
* The above returns results, with some entries having `jdk_version` valued at `21`.
* But when adding `jdk_version` to the request, no packages are returned
* https://api.foojay.io/disco/v3.0/packages?jdk_version=21&distro=graalvm&operating_system=linux&directly_downloadable=true&latest=available

Am I missing something?

Investigaton done in the context of:
* gradle/foojay-toolchains#95