Artifacts available for testing here: https://build.geoserver.org/job/geoserver-release/43/artifact/distribution/2.20.3/
Release notes (no longer in jira): https://github.com/geoserver/geoserver/releases/tag/2.20.3
We are still watching the windows job have trouble with permissions, it creates the installer though which is the main thing.
Not aware of any special needs for testing, there is a new ENTITY_RESOLUTION_ALLOWLIST to try out.
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Jody Garnett