I cannot see how this could possibly happen with 2.2.9.Final. Can you debug with a breakpoint at AbstractCDI class line 105? https://github.com/weld/core/blob/2.2.9.Final/impl/src/main/java/org/jboss/weld/AbstractCDI.java#L105

javax.enterprise.inject.spi.Unmanaged should never be returned from that method since Unmanaged is added to the set of knownClassNames.