Javadoc issue with NetBeans 17

It depends on how you've added the PluginAPI.jar to your netbeans project

The platform manager (on your screenshot) is only relevant for the JDK (including the Javadoc for the JDK). To set up the API, I'd recommend to use this option (it's for the Java version, but mostly still relevant for the new version): https://forum.rising-world.net/thread/4743

In short, it's recommendable to add the Plugin API as Library. In Netbeans 17, go to the project Properties -> Libraries -> hit the + next to "Classpath" and select Add Library.... Click Create to create a new library (give it a name like "Rising World" or "Plugin API"). In the "Classpath" tab, hit Add JAR/Folder and add the PluginAPI.jar file. Then go to the "Javadoc" tab, hit Add URL and insert https://javadoc.rising-world.net/latest/. Confirm with Ok.

If you've added the PluginAPI.jar directly to the Classpath before (in project properties), remove it, so only your newly created "Rising World" (or "Plugin API") library is there. Now the Javadoc should work properly in Netbeans