Game crashes after unloading bike raack

[BrassRobo]

Describe the bug

The game crashes when unloading a bike rack if you've modified the vehicle on the rack.

Steps To Reproduce

Steps to reproduce the behavior:

1. Build a small vehicle with bike racks.
2. Build a second vehicle right next to it.
3. Load the second vehicle on to the first.
4. Add more frames to the loaded vehicle

Expected behavior

The vehicle unloads successfully.

Screenshots

Versions and configuration

debug.log

Additional context

crash.log

save.zip

[jeremyshannon]

I had this happen. My bike had wheel mounts automatically added (by the wheel update) which didn't have a "carry:" tag -- so they're part of the base vehicle instead of the mounted bike. There was also a seatbelt which somehow lacked the "carry" tag, it may have been damaged and replaced? Removing the affected parts allowed the bike to be unloaded without crashing the system.
I imagine it's trying to remove the "carry" parts, and it ends up with free-floating parts hanging off the side of the vehicle in an impossible way.

[jeremyshannon]

Oh yeah, savegame surgery to add the "carry" flag to the affected parts solved the crashing issue for both my save and the attached one. It's definitely the lack of that flag causing problems.

[jeremyshannon]

Fixed by #38767