Some actions like eating, drinking, charging a bow or crossbow, or looking through a spyglass are interrupted when you start or stop flying in creative mode. (Touch) (Jump and sneak inverted) 

Steps to Reproduce:

• Give yourself a food/potion/bow/crossbow/spyglass. 
• Press and hold the screen to load/trigger/ingest the item.
• Immediately jump twice to start flying while the item action is not yet complete. 
• Do the same as the previous point, only stop flying before the action ends.

Observed Results:

 If you do not stop pressing, when you start or stop flying the action will be canceled and it will resume when you are already / have stopped flying.

Expected Results:

The action is not canceled no matter how much you start or stop flying.

Additional Info:

For the bug to reproduce, you must remain with the camera in the same position. If you move the camera while looking at the ground (I don't know if that's the only situation or if that's the specific reason), the bug is undone and the actions are no longer cancelled.