Updated description by GoldenHelmet

When an opaque block is next to a connectable side of a powered rail, and the powered rail is activated by redstone power, a minecart on the powered rail should be propelled away from that block. This does not work with:

• sea lantern
• barrel
• redstone block

Steps to reproduce

1. Place a line of powered rails.
2. Place one of the affected blocks at one end of the line.
3. Place a minecart on the powered rail next to the affected block.
4. Activate the powered rails with redstone power.

Expected result

The minecart is launched down the line.

Actual result

The minecart does not move.

Test world

The attached test world Blocks launching minecarts.mcworld demonstrates how most blocks that can be powered will also launch minecarts, but the affected blocks mentioned above fail. Simply open the world and flip the lever. For the barrel, due to MCPE-46742 you will have to break and replace to see this bug in 1.14.60. Note that the world is only desinged to only be run once, it does not have a simple reset.

Original summary
sea lanterns and powered rails
Original description

when powering a powered rail with a button on a sea lantern the mine cart dose not move at all until the player faces forward and presses the w key to move  [^Minecraft 2019-10-16 21-47-08.mp4]