chris, yesterday i was able run at least one test case by using the following dependency from the following repository:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.3.2-SNAPSHOT</version>
</dependency>
<repository>
<id>snapshots</id>
<url>http://snapshots.jboss.org/maven2</url>
</repository>

today i wanted to revert back all my workarounds to use @Enumerated again everywhere and was stuck again at the same place as reported initially. Could please check whether the latest snapshot in this repository still contains your revisions?thanks.