Minecraft wiki entry for Development_versions, associated text: MC-147754 – Crash while opening world / while ticking entity: "IllegalStateException: POI data mismatch: already registered at ev{x=##, y=##, z=##}".
MC-147800 – Chunks nearby getting a full reset if load with 1.14pre1.
MC-147951 – Cartography table does not lock maps.