Consider this example used to test JavaDoc:

    package x;

    public class Parent {

        /** @throws X sometimes */
        public <X extends Throwable> void m() throws X { }
    }
    
    ...
    
    package x;

    public class Child extends Parent {

        /** @throws X {@inheritDoc} */
        @Override
        public void m() { }
    }

When asked for an element corresponding to a doc path pointing at `X` in "@throws X sometimes", the DocTrees.getElement methods returns a package element with the name `X`.

If either the package `x` or the "type parameter" `X` gets renamed to a unique identifier, that method returns `null` as one would expect it to.

Since this bug can only be reproduced on macOS, I have a suspicion that it's due to the filesystem (APFS) being case-insensitive and/or case-preserving.

On Linux and Windows DocTrees.getElement for the above case returns null.