More information here:
http://mail.openjdk.java.net/pipermail/beans-dev/2016-May/000307.html

When the parent class has a "Enum getE()" method and subclass have a number of setE() including setE(Enum) we skip all them, because then we validate the subclass we simply select the first setE() which is not necessary setE(Enum).

Note that behaviour when the bean have such mislead write methods is unspecified.