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Follow-Up Bug Report: Steering Issue with Colossus 9000 + Certain Headers (Map-Dependent)

Hi again! After a lot of in-depth testing, I wanted to share a full update on the steering issue with the Colossus 9000 harvester when using certain headers. Hopefully this helps reproduce and troubleshoot the bug more easily.

Testing Summary:

• Tested across approx. 15 maps.

• All non-essential mods were disabled.

• Only required map mods and the Colossus 9000 mod pack were enabled.

• All maps (unless otherwise noted) were downloaded from ModHub.

• Only listing maps where the bug occurred — all others worked fine.

Key Discovery:

Originally, I thought the bug only happened when a header with transport wheels was attached as a trailer. But I later found that:

The same steering issue also happens when the header is attached in work mode (no trailer involved). So, the issue occurs regardless of how the header is connected if it has built-in transport wheels, or not.

Detailed Findings:

1. Headers with Built-in Transport Wheels

   • When attached in trailer mode, the Colossus can move forward/backward, but steering doesn't work.

   • When attached in work mode, steering is still disabled.

   • In both cases, the wheels do not turn visually, and the machine does not steer.

2. Headers Without Transport Wheels

   • On some maps, even standard headers (no transport wheels) cause the same issue when attached in work mode.

   • This shows the bug is not only about transport wheels, but possibly something with how certain headers interact with the harvester or the map.

3. Map-Specific Behavior

   • The bug does not happen on all maps.

   • On some maps, everything works fine with the same headers.

   • On other maps, attaching one of these headers immediately breaks steering.

Maps Where the Issue Occurs:

• Prairie Farm Michigan (no mods required)

• Calm Lands

  • Placeable Ramp

  • Low Cost Grain Silo

  • Old Storage Shed

• Oak Bridge Farm (no mods required)

• Bergschof (from KingMods)

  • Barn with Cows

  • Cowshed Pack

  • Machine Storage

  • Machineshed 35x20

  • Shed Pack

  • Farmhouse Shed Package Volume 3

Note: The issue happens even on brand new saves. Just loading the map and attaching the header causes it.

Conditions That Break Steering:

• Header with transport wheels, attached in trailer mode → steering fails (on some maps)

• Header with transport wheels, attached in work mode → steering fails (on some maps)

• Headers without transport wheels, attached in work mode → steering fails (on some maps)

Conclusion:

This seems like a compatibility bug between the Colossus 9000 and certain headers, especially when combined with specific maps. It may be related to map-level physics, axle handling, or terrain collision settings.

Happy to Help Further:

I have over 60 maps installed and can test more if needed. I can also provide logs, save games, or short videos if that helps.

Thanks again for the mod — I hope this helps narrow it down!

PS: I also know that I did not need to include the mods that the map requires, since we have concluded that it's map dependent and not mod dependent, but I like to be through, in my report.