See this video.
Basically, a while after I laid out my lines (exact week number varies), the new week bonus screen becomes glitched: clicking any bonus just adds it without dismissing the bonus screen, and I can even click it multiple times to obtain more than one bonus. But it’s useless, as no matter how many times I click the bonus, the screen won’t go away, and as a result I can’t continue the game. The mouseover effect is also glitched.
I have the “Mini Metro More” mod installed, but it hasn’t caused any issues before.