Ok, so the issue is that the dependencies added for the new HV modules (engine + CDI) lacked the import=true statement. This caused their META-INF/services/... files not be exposed (by default they are not exported), causing the 6.0 portable extension not to be picked up (in turn causing injection of @Inject Validator to fail) and also causing HV not to be found as a BV provider. I'm going to send an update shortly.