Minecraft wiki entry for Development_versions, associated text: MC-192136 – Lava damage works differently than in previous versions.
MC-192236 – Endermen can place blocks on top of item frames on the floor.
MC-192371 – Paintings in the same block space pop off when chunk loads.
MC-192845 – Block event lag in 1.16 is excessive.
MC-195851 – Hat layer on helmets detaches from piglins' heads while bartering.
MC-196245 – Charged creepers do not always drop their skull if zombie variants are nearby.