Put the summary of the bug you're having here
What I expected to happen was...:
When jumping from elevated level or using rockets, elytra should function
What actually happened was...:
Fell to death
Steps to Reproduce:
1. Built a tower
2. Jumped off
3. Activated elytra in normal manner
4. Fell to death
Within the same game session, the Elytra would inexplicably start working again, and then a minute or two later, stop.
Related issues
Comments

Only single player.
I started a new single player world when the 1.14 snapshots started coming out, and play only in the snapshots on that world (tad challenging when dealing with various bugs). After the release of 19w02a, I started having several issues in the world, most notably not being able to depend on the Elytra to work. I have noticed the server ping as high as 55ms and typically never gets below 35ms (prior to this snapshot however, never really went above 35ms).
⚠️ Please do not mark issues as private, unless your bug report is an exploit or contains information about your username or server.
Are you on a singleplayer world or on a server?