Operating system: Windows 10
Graphics card: NVIDIA Quadro M1200
Blender Version
Broken: blender2.8 26d5a3625ed 2018-11-29
Worked: 2.79b
Short description of error
Keyframes for both Viewport Visibility and Render Visibility are not honored in the viewport nor in renders.
Exact steps for others to reproduce the error
Open blender and select the default cube
Expand the Collection
Right-click on the cube's "Disable Object in the Viewport" icon (the computer monitor icon) and insert a keyframe
Right-click on the cube's "Disable object in renders" icon (the camera icon) and insert a keyframe
Advance the timeline to frame 5
Left-click on the cube's Disable object in the viewport icon, then right-click and insert a keyframe
Left-click on the cube's Disable object in renders icon, then right-click and insert a keyframe
Optionally, set the animation's End frame to 10
Play the animation and notice that the cube never reappears; it's simply invisible for the duration of the animation
Render the animation and notice that the cube's visibility does not change on frame 5