Status of mixed mode lights

Have mixed mode lights been fixed in 5.4?

I'm under the impression that mixed mode lights should cast shadows from non static geometry onto static geometry and vice versa. I believe that Unity have acknowledged this as a bug and fixed the issue in 5.4 (for examples, see this thread)? I've tried to get this working in 5.4 but failed miserably.

Have I misunderstood mixed mode lights or is this still an issue?

Example scene screenshots below (from 5.4.0b5). All geometry is static except the ball / sphere. Same results in both forward and deferred.

Realtime lights:


Mixed Mode lights:


EDIT: I have kind of got this working using a single mixed directional light - the shadows are a little messed up though.