For me it sounds that you were 100% Lucid until the FA happened. You were aware of that it was a dream and that you were sleeping, you remembered things you read in your wakening state and decided by yourself what you want to do, so you were in full control.

But I never heard of becoming lucid, than have an False Awakening and losing lucidity immediately despite an obvious dream sign.
I just asked the question in the IRC Channel, and Paigeyemps said it is in fact quite normal, because your brain think you're not dreaming anymore, so it's like a reset of your awareness.