Minecraft Username:vengfulbacon Brief Description:whenever i ride my afk rail, i take damage. Instructions:one set up a 200x16 afk rail, ride it, take half a heart of damage every so often. How many times did you recreate this bug?:at least 10 times and counting. Result:half a heart of damage is taken from my health bar Expected Result:no damage taken Evidence:
Expanding on what jw said. It may be associated with a bug that gives you fall damage while riding in minecarts. Google it and see what you can find.