Google Charts was updated to version 45, as announced on this list. The actual rollout was delayed until today, but you probably saw an intermediate rollout that I had to rollback.
The lines are domain annotation lines, and it was actually a bug that they were not showing up, so you will have to fix this in your code. I see that you are setting the first column's role to 'annotation' which is what is doing this. Before, this was effectively ignored, so perhaps it will be easy enough for you to just leave that column out. Or perhaps set the 'line' annotations color to transparent.