Player's movement detection is wrong when jumping from an edge of a block next to cobweb

Steps to reproduce:

1. Build a 4 blocks jump with 1 block momentum.

2. Place a cobweb at the in front of the starting block. (Same as the video shown)

3. Switch to survival mode.

4. Sneak to the back edge of block, press Forwaed and Jump at the same time, then immediately add sprint, and don’t release the buttons. (This is called “force momentum” in parkour)

5. Check if you can do the jump or not.

6. Switch to creative mode and repeat step 4-5.

7. Break the cobweb, switch to survival mode and repeat step 4-5.

The steps are shown in the video attached.

Observed result:

You will stuck in the cobweb in step 5, and you can do the 4 blocks jump in step 6-7.

Expected result:

You can do the jump in step 5-7, non of them will let you stuck in the cobweb because you didn’t touch it at all.

Analysis:

Cobwebs have a wrong movement detection when you jump from the edge of the block next to cobweb with >0.25b/t speed.

“Player Moved Wrongly” Printed into the console when you try to jump at the edge and you’re lagged back into the cobweb.

Seems this is a desync thing between client and server.