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Setup is the same as for issue #25428. But now for the methods from DataFolder, select e.g. void handleDelete() throws IOException No Javadoc is displayed. DataFolder.handleDelete overrides the method from MultiDataObject but has no Javadoc of its own. MDO also overrides w/o own Javadoc. DataObject supplies the Javadoc for it. IMHO the Javadoc from DataObject should be displayed, to be consistent with the JDK's javadoc tool starting with JDK 1.3: when a method override does not override the Javadoc, you can see the superclass Javadoc instead.
Set target milestone to TBD
See also issue #7115.
BTW - cf. issue #30562.
There's a fix for a related problem in the tasklist module; see issue 24406 for a description of the method in DocSuggester.java. There is an overloaded method inheritsJavadoc(); the second method obtains the actual Javadoc object (and simply tests for isEmpty()); you could modify this to be javadoc.getRawText() and then display that.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss