How to reproduce
Be in creative mode
Create a ceiling (any block will do so long as it is not stairs)
Get an elytra
Start flying
Press the jump button to gain height until you reach the ceiling
Observed result: you clip through the wall
Expected result: you go no where
Related issues
is duplicated by
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fixed the issues

has anyone tested this in survival mode?

The same issue can occur in survival mode if the player lands in a 1x1 tunnel, or unequips their elytra mid-flight. There is currently no check to put the player into the swimming mode when using an elytra, nor using a riptide trident: MCPE-55864.

I am thinking about providing a video of the glitch

Affects 1.18.0.21

Possibly related to MCPE-85052

Affects in 1.19.83 & 1.20.10.20 Preview

I might clips trough with flying without gliding like this
[media]

Could reproduce in survival by firework rockets.
Analysis:
When you press space while gliding under a ceiling, you will exit gliding, and your hitbox will update from 0.6 blocks to 1.8 blocks, so you will stuck in the block upon you. When you press space the second time, you will start to glide again. At this time, the thrust of rocket doesn't end, so you could go through the block you stucked in.
Still affects in 1.20.10.20 Preview after Short Sneak and Crawling experiment enabled.

Affects 1.20.12

Cannot reproduce in 1.20.20.23 Preview.