memberOf operator throws ClassCastException in rules written in BRMS platform

Issue

Given a Rule with the pattern:

SomeFact( group memberOf ( Arrays.asList("010,015".split(",")))

That pattern is used in decision tables where "010,015" is keyed in by users into a spreadsheet.
It worked until the release of BRMS 5.3.0, which throws the exception below:

java.lang.ClassCastException: Can't check if an attribute is member of an object of class class java.lang.String
    at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
    at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1201)
    at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1126)
    at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1349)
    at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
    at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
    at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:228)
    at com.sample.DroolsTest.main(DroolsTest.java:31)