I think this is a bug. It pretty makes the run key useless because the point of the run key is not having to let go of the move forward key.
MC-68656
Releasing the "Run" key does not stop the player from running.
Resolved
Works As Intended
0
This is how it has been implemented. It is actually a handy feature when sprinting for long distances so you don't have to hold down two keys at once.