Thank you, but I don't understand. Why doesn't it happen when I go back to 0.17.53? I can just stick to .53 for this scenario, right?

Thank you for the response, and my apologies for reporting a "not a bug"-bug... I'll just stick to the older Factorio version then

I play the Diggy scenario from RedMew, in it you get a walking speed boost depending to your level in the scenario. When updating to 0.17.54 this does not work anymore. I tested this by going back to 0.17.53, and there the speed is normal again.

I don't see anything in the .log files in the ...