[2.0.73] "Rail signals advanced" tutorial lets you continue several steps just for running the trains

[Foobaring]

Introduction
In the tutorial called "Rail signals advanced" (in the "Trains" section), you can play a tutorial.

This tutorial starts by explaining to you how the chain signals work, and lets you run the trains in the first steps, just watch what happens, and then it lets you continue (by pressing the "Continue" button) to the next steps. This is expected behaviour.


The problem
However, there comes a step where you have to solve a puzzle to demonstrate you have understood the explanation. This is the "puzzle1" image I have attached to the post. Here is where the problem begins.

At the start, it begins with the "Continue" button blocked, but if you just run the trains once, the continue button unlocks, even if you don't solve the puzzle or do anything else.

Steps to reproduce
- Start any game (new game or by loading)
- Open the tutorials window
- In the list, left click the "Rail signals advanced" tutorial.
- Click on the button to play the tutorial (it could say "Play tutorial" or "Replay tutorial", in my case it was "Replay")
- Click the "Continue" button on the first "explanatory" steps until you arrive to the first puzzle step, in which the "Continue" button is disabled.
- Click the "Run the trains" button.
- Wait at least 10 seconds without pressing anything.

Expected behaviour: The "Continue" button should still be locked, because you have not solved the puzzle.
Observed behaviour: The "Continue" button unlocks

This seems to happen in several puzzle steps, not just the first one. I think it happens specially when vagons don't crash at each other.