[2.1.19] Transport Belt Madness save from 2.0 Lua runtime error

[Courmisch]

What I did?

• Loaded a vanilla (Belt Madness) save from version 2.0.72. No mods.
• Placed an underground.

Save file: https://drive.google.com/file/d/1mRR2Oh ... drive_link

What happened?

Lua run-time error stated to contact the scenario developer and threw me back to the main menu.

What I expected?

Game proceeds. Alternatively refuses to load the 2.0 Belt Madness saves if they are not "upgradeable".

[boskid]

Thanks for the report. Issue should be fixed for 2.1.20 by means of using an old forgotten script reload migration.