So, as a test, I did as @Cobra suggested and used the playTextAndResume. It did play the text and then resumed, but it did so back to the beginning of my playlist. When I tested it again (with the same text), it played the TTS and then stopped. Then, as a third test, I changed the text completely and it reproduced the first results.
So, I'd venture to say that Sonos STILL has an issue when it comes to playTextAndRestore(). I don't think it's a driver issue so much as a Sonos issue. 
