IncompleteClassHierarchy Exception with a kotlin + micronaut grpc service (Bug?)

Getting this error with my proguard rules applied for my kotlin + micronaut based grpc service. I’ve tried keeping org.postgresql.** and javax.security.** classes, but still no luck

proguard.evaluation.exception.IncompleteClassHierarchyException: Can't find common super 
class of [org.postgresql.shaded.com.ongres.scram.common.exception.ScramException]
 (with 1 known super classes: 
org.postgresql.shaded.com.ongres.scram.common.exception.ScramException 
and 1 unknown classes: javax.security.sasl.SaslException) and [java.lang.IllegalStateException]
 (with 5 known super classes: java.lang.RuntimeException, java.lang.Object, 
java.lang.IllegalStateException, java.lang.Exception, java.lang.Throwable)