The Elytra on Bedrock edition has a glitch where if you try to deploy it when you are right above the ground, every now and then, you can go through blocks. What I mean by this is that you go through the block your head typically hits, but cant go through the block your feet hit. A scenario that I experienced with this glitch was when I was on my way back to the overworld from my enderman farm. I encountered the glitch while i was using the guard rail, and I didnt have my elytra on. This happened a few months ago, but it still is happening to me in the overworld as well.

To reproduce this bug:

1. First, find an area where its 1 block above 
2. Then, jump off that, and deploy your elytra right before hitting the ground.

That was the main problem in my worlds. Its tricky to do on purpose, but on accident, it can happen around 10 times an hour.