How do i make a part "update" to a new BodyPosition?

I have a script that changes a parts bodyposition.Position, but the part isn't moving to the new position. With that, the part starts working if you move it/"Update" it with the move tool while playing in the editor.

Here's the script in case it's the problem:

brick = script.Parent --find brick
startposition= brick.Position
bpos = brick:WaitForChild("BodyPosition") --find bodyposition
bpos.Position = brick.Position --set position automatically

startpos = brick.Position --set start position

Instance.new("BodyGyro",brick)

script.Parent.Anchored = false

--movement
while wait(brick.time.Value) do
    bpos.Position = startposition+ brick.direction.Value
    wait(brick.time.Value)
    bpos.Position = startpos --return to start
end

Here's the part and its' components: https://i.ibb.co/M5WPF5F/Capture.png