N910F Marshmallow 6.0.1 - notification previews not working

I upgraded to Marshmallow a few days ago and also performed a factory reset yesterday and at some point notification previews seem to have stopped working. This was really useful for getting a quick read of an incoming sms without needing to open the message.

I checked via system settings and in-app settings and previews are turned on everywhere but they're not working! Is this a bug with Samsung's Marshmallow firmware? Any ideas on how to restore the feature?


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