Unfortunately yes, I haven't heard of any progress on this bug. I'm really sorry; I know it's frustrating to have something working and become a critical part of your workflow and then break like this. My limited understanding is that the bug is more complex than it may seem on the surface, but I don't know the specifics under the hood.
The workaround I would recommend would be what we show in the recent Express Animation tutorial. Basically, your triggered Replays become your different poses and you swap between them to achieve the pose-to-pose look. If you only wanted the head you could make a set of Face-only replays and then do the other things like arms and lip sync separately. The blend handles between poses would equate to the duration / smoothness of the transition between poses. This system is essentially what we do when creating Express characters with "automatic" animation. I know it's not the same, as pose-to-pose just worked in the background without needing this more manual setup, but it should ultimately achieve a similar effect.
Again, I'm sorry this bug has lingered for over a year without a clear fix. If anything changes I will udpate this thread, but my recommendation for the forseeable future would be to explore different workflows.
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