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I randomly opened a 2.0 savefile in 2.1 and got this crash.

To reproduce please ignore all mods without 2.1 release, I did the same.

I don't know why this specific save file crashes, I tried a save from a few hours later and that loaded fine.

Py had some breaking changes in the 2.1 release, construction zone extenders (roboports) previously had charging slots and now they no longer have them. Just thought I mention this because I saw robot stuff in the stacktrace.

Thanks for the report however I'm not sure there's anything that can be done here. This crash indicates that the save file is corrupt. The only known ways this specific crash has happened in the past have been due to failing hardware where an entity position was corrupted before being saved to disk resulting in it teleporting to a different location on load - but being attached to its original location. Any mod changes, version changes, or configuration changes result in the game finding this inconsistency, being unable to resolve it, and crashing.