On the 14th Feb, night prior to 1.16, the generator in our watchtower worked fine. This included being able to see the generators inventory displaying the spark plug whenever we would open our inventory.
Following the 1.16 update the prompt to turn the generator on no longer comes up as an option. The generators inventory no longer appears whenever we open up our inventory despite the generator displaying a plus symbol when looking at it. Finally it is also now possible to walk through the generator.