Minecraft wiki entry for Development_versions, associated text: MC-189856 – Unable to set nether portal block with /setblock or /fill.
MC-189867 – Cannot use /setblock and /fill to place blocks in positions they cannot normally be in.
MC-189868 – Player gets set on fire and extinguished continuously when standing in fire in creative mode.
MC-189895 – Redstone in jungle temple/pyramid no longer connects to blocks and redstone components properly.
MC-189903 – Turtle home beach detection looking one block too deep.
MC-189905 – The player can get stuck inside of the world border.
MC-189968 – Mobs suffocate when touching the world border.
MC-189971 – Clicking the "Take me back" button causes translucent blocks to stop rendering.
MC-190010 – The game crashes when using a mouse button to swap item in hands while inside of an inventory but not hovering over a slot.