The current Kubernetes supported versions in Agones 1.48 are listed as 1.29, 1.30, 1.31.
https://github.com/googleforgames/agones/blob/main/site/content/en/docs/Installation/_index.md#agones-and-kubernetes-supported-versions

The release documentation and the documentation at the time of the 1.48 release state that the Kubernetes supported versions are 1.30, 1.31, 1.32, and the version has changed.