Landing on falling entities does not count as landing on blocks

[BoatMeat]

Describe the bug
Falling from any height onto a claimed anvil that is rapidly having a piston extend and retract underneath it will make it so that when a player lands on it they will take no fall damage, and will instead jitter violently on top of the anvil until the step off of it, which will cause them to take the intended fall damage. A player can interact with their surroundings normally while on top of the anvil and can easily place a bed and set their spawn. This is not 100% consistent but works better if the contraption is lower in a section.

To Reproduce
Steps to reproduce the behavior:

1. Place a block, then place an anvil on top of that block and claim it with a sign.
2. remove the block, the anvil should completely vanish when block is removed, and place a piston so that when it extends the head will be underneath where the anvil used to be visible.
3. attach a fast redstone clock to the piston and activate it, this will cause the anvil to begin blinking rapidly as the piston extends and retracts underneath it.
4. Fall from any distance onto the anvil, you will not stop on top of it and begin to jitter up and down, from there you can easily place and sleep in a bed. If you walk off of the anvil, you will take the fall damage equivalent to the distance you fell.

Expected behavior
You should take fall damage instantly.

Screenshots
Video: https://youtu.be/nX2JEjTJDlw

Additional context

[0ffz]

I am somehow both impressed and disappointed in your creativity.

[0ffz]

The best solution i can think of is probably to rework our system to use something other than builtin velocity.

Minecraft velocity is super inconsistent, for instance flying doesnt actually set the velocity afaik, so something like gliding down on an elytra and slowly tilting yourself up will eventually trigger ALL the damage. I have a feeling the velocity remains unchanged in this senario and damage doesnt trigger.

Really what we're interested in is dealing damage upon high acceleration, i.e. when there's a great change in velocity over a small period of time. It may be worth calculating this ourselves.