System Information
Operating system: Ubuntu 18.04.1
Graphics card: AMD RX 580 (8GB memory)
Blender Version
Broken: (2.80.42, 1b6da95ccb11, 2019-01-25)
Short description of error
I have written an addon for 2.7 that worked using the function:
bpy.app.handlers.frame_change_post.append(my_function)
That function is used to call a function every time the current frame of the timeline changes.
It works in 2.79 as, for every current frame change, it calls my_function that updates all the values on the nodes, rotation of the objects etc...
In 2.80 it does change all the values and rotation of objects for every frame, and the viewport gets an update, but as you can see in the viewport it changes only the sun rotation and not the sun disk in the world environment, meaning that all the values get updated but there is no change in the viewport except for the sun object rotation.