Error trying to connect to Teiid using 8.3 code in Designer against an 8.4 server

This is the stacktrace I got when testing the connection to Van's new cluster at
redhat-stl-eng3.usersys.redhat.com.

org.teiid.adminapi.AdminProcessingException: TEIID70036 java.lang.IllegalArgumentException
at org.teiid.adminapi.AdminFactory$AdminImpl.getVDBs(AdminFactory.java:1433)
at org.teiid.adminapi.AdminFactory$AdminImpl.getVDBs(AdminFactory.java:1)
at org.teiid83.runtime.ExecutionAdmin.refreshVDBs(ExecutionAdmin.java:658)
at org.teiid83.runtime.ExecutionAdmin.init(ExecutionAdmin.java:575)
at org.teiid83.runtime.ExecutionAdmin.<init>(ExecutionAdmin.java:136)
at org.teiid83.runtime.ExecutionAdminFactory.createExecutionAdmin(ExecutionAdminFactory.java:29)
at
org.teiid.designer.runtime.registry.TeiidRuntimeRegistry.getExecutionAdmin(TeiidRuntimeRegistry.java:102)
at org.teiid.designer.runtime.TeiidServer.connect(TeiidServer.java:212)
at org.teiid.designer.runtime.TeiidServer.reconnect(TeiidServer.java:232)
at org.teiid.designer.runtime.ui.server.RefreshServerAction$1.run(RefreshServerAction.java:58)
<snip>
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
Caused by: java.lang.IllegalArgumentException
at org.jboss.dmr.ModelValue.getKeys(ModelValue.java:124)
at org.jboss.dmr.ModelNode.keys(ModelNode.java:1194)
at org.teiid.adminapi.AdminFactory$AdminImpl.getDomainAwareList(AdminFactory.java:1349)
at org.teiid.adminapi.AdminFactory$AdminImpl.getVDBs(AdminFactory.java:1430)
... 48 more