An entity that gets the NoGravity tag while falling does not stop moving until 15 seconds

The bug

If you spawn an entity (that either starts floating or falling) and use the command

/data merge entity @e[type=minecraft:falling_block,limit=1] {NoGravity:1b}

the entity doesn't stop moving until some seconds, instead of that it goes more and more slowly.

How to reproduce

Method 1:
Create a falling_block by placing a sand block, immediately after that use the command (said above)

Method 2:
Set a command block as 'Repeating' and 'Always Active,' place a dropper with something inside and give the dropper power