I've also noticed it only works sporadically for me in the most recent firmware releases.
And in an odd twist of the working/not working randomness, I notice for texts that do not come through but should have, and that are marked read, when I reboot the device, the text (did I mention marked as read) will come through, at about 15 seconds into the reboot cycle.
For the record the sporadically behavior I observe is not to be confused with the (presumably) 'by design' feature that only delivers the first SMS message in a thread of messages and replies, see
here.