If you are kicked from the server and see an error message that looks like this:
Caused by: com.viaversion.viaversion.exception.InformativeException: Please report this on the Via support Discord or open an issue on the relevant GitHub repository
It is caused by the plugin that lets you connect with older versions not being able to get the data from an old player head either in your inventory, at your base, or possibly in your chest. Please try reconnecting with version 1.19.3 and clear out some older heads from your location before attempting to connect again with an older version.