Dispensers do not dispense boats as high as they used to, before 1.20 Pre-release 2. This means that dispensers no longer dispense a boat high enough to sit on 2 blocks of water, like they did in earlier versions. This is likely an unintended result of MC-1310 being fixed.

Versions before 1.20 Pre-release 2:

1.20 Pre-release 2: