Flying but not flying bug

I was testing the new snapshot for 1.11.1, and I dived to land and then ran into this bug. I recorded it right after it started.

The player was like it was flying, but it was actually walking around. I tried taking the Elytra off, but it did help.

Video: https://youtu.be/_N57l6_f1ms . It is unlisted. I posted it on YouTube since it is 26 megabytes.

Note: the bug was fixed when I restarted the game.