Minecart can not pass between water and water.

Hello

1.13.2: Minecart can pass between water and water. (Dark background in screen shot.)
Pre-Release: Minecart stuck between water and water. (Orange background in screen shot.)

And I have a question. (another kind)
Where can I get accurate informations about villagers?
(Like: To spawn an Iron golem how many villagers do I need?)

Have a nice day!