Minecraft wiki entry for Development_versions, associated text: MC-138633 – The title screen needs updating in 1.14 snapshots.
MC-139378 – "Exception while ticking" crash when Scaffolding falls onto a Shulker Box
MC-139692 – Chests in ocean ruins not opening
MC-139694 – Water blocks aren't filled in if above an ocean ruin.
MC-139955 – Ocean ruins can spawn completely obliterated in certain chunks.