Wisterwild Server Update: Java Rollback Needed
Summary
The Wisterwild community has issued a server update notice indicating that players using the Java edition must roll back their game version to 1.21.8 or older. This is necessary because the server is still waiting for an update from Purpur. Bedrock players can use the latest release, though they won't see new content as the server is pre-copper-age.
Still no update from Purpur. If you update your Java game version to 1.21.9 you will need to roll back to 1.21.8 or older to play while we wait for the latest release.
Bedrock should be able to join on the latest Bedrock release; however, we are still on pre-copper-age content so you won't see if yet in the server.
Thanks @Friend !