When flying into a 1x1 whole with Elytra, you get suffocated and you die. You cannot escape.
(Confirmed with a .gif file)
To reproduce:
1. Make a 10x10 wall that is 1 block thick.
2. Break block so you have all blocks are diagnol, but not touching. (Make 1x1 holes between each block.)
3. Build a tower near by and stand on top of it.
4. go into survival and fly toward a hole.
5. Hold shift as you near the hole.
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Yes

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.
Can confirm for 16w42a

Same issue as MC-90598.
Can confirm, added gif animation.