Description: Minecarts rode by players do not stop when entering powered rail. Minecarts rode by players are also possible to accelerate by pressing W (walk forward button) to accelerate when being on unpowered rail, showing the same behaviour as normal rail.

However, empty minecarts, minecarts rode by other entities such as a villager, hopper minecarts, chest minecarts, furnace minecarts and tnt minecarts are not affected.

Expected behaviour: Minecart rode by player stops promptly when passing through unpowered rail, and is not able to accelerate on unpowered rail without redstone power.

Actual behaviour: Minecart rode by player only slows down to a rather low speed when passing through unpowered rail. It is also possible to accelerate the minecart by pressing W (walk forward button) on unpowered rail as if being on normal rail.

Steps to reproduce (stopping test):

1. On a world with "minecart improvements" experimental datapack enabled, set up normal/powered rail, then connect it to several blocks of unpowered rail.
2. Place and ride on a minecart. Accelerate the minecart by pressing W (walk forward button).
3. When the minecart reaches the unpowered rail section, notice that it only slows down and continues its movement very slowly.

Steps to reproduce (accelerating test):

1. On a world with "minecart improvements" experimental datapack enabled, place a minecart on unpowered rail of several blocks long, and ride on it.
2. Attempt to accelerate the minecart by pressing W (walk forward button).
3. Notice that the minecart is possible to accelerate without the rail being powered by redstone.

Attachment (video of testing): https://youtu.be/Lultj2C0oH8