ADDITIONAL SYSTEM INFORMATION :
Microsoft Windows [Version 10.0.17763.348]
OpenJDK 11.0.2+7
OpenJDK 12-ea+32
OpenJDK 13-ea+10

A DESCRIPTION OF THE PROBLEM :
See repro steps below

REGRESSION : Last worked in version 11.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create testcase as mentioned below
2. "cd target"
3. "javadoc.bat"
4. Open the Javadoc for com.company.Child
5. Notice that "methodMethodLink" listed in the method summary is missing a hyperlink to the detailed description below.
6. Edit javadoc.bat so it runs JDK 11.0.2
7. "javadoc.bat"
8. Notice that Child.methodMethodLink contains a hyperlink as expected.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
methodMethodLink should link to the detailed Javadoc at the bottom of the page
ACTUAL -
methodMethodLink is not linked

---------- BEGIN SOURCE ----------
src/main/java/com/company/Child.java:
--------------------------------------------
package com.company;

public abstract class Child extends Parent<String> {
    private static final Child INSTANCE = new Child() {
        @Override
        protected String methodMissingLink() {
            return "test";
        }
    };

    public static Child getInstance() {
        return INSTANCE;
    }
}
--------------------------------------------

src/main/java/com/company/Parent.java:
--------------------------------------------
package com.company;

abstract class Parent<T> {
    /**
     * Returns some value.
     *
     * @return some value
     */
    protected abstract String methodMissingLink();
}
--------------------------------------------

target/javadoc.bat:
--------------------------------------------
rem "C:\Program Files\Java\jdk-11.0.2\bin\javadoc.exe" @options @packages
rem "C:\Program Files\Java\jdk-12-ea+32\bin\javadoc.exe" @options @packages
"C:\Program Files\Java\jdk-13-ea+10\bin\javadoc.exe" @options @packages
--------------------------------------------

target/options:
--------------------------------------------
-sourcepath
'../src/main/java'
-d
'.'
--------------------------------------------

target/packages:
--------------------------------------------
com.company
--------------------------------------------
---------- END SOURCE ----------

FREQUENCY : always