When a /player stop is initiated after /player move, the player will decelerate slowly as if he's in fly mode, and doesn't stop instantly when the stop command was executed.

This was discussed on Discord

https://discord.com/channels/882822986795716608/1037262867860295761/1037262867860295761

and probable reason for it here:

fabric-carpet/src/main/java/carpet/helpers/EntityPlayerActionPack.java

Line 152 in c51f59c

public EntityPlayerActionPack stopMovement()

Duplicated of #1072