Save crash after 50h – double entity / EnergySource bug

[Fifi]

Hello Factorio team,

My save (and all auto save) crashes immediately on load after ~50h of gameplay.
I’m running Factorio 2.0.76 (build 84451) on Windows 11, also tested on Mac.

**Steps I’ve tried:**
- No mods (vanilla game)
- Autosaves disabled
- Headless server mode
- Threads = 1
- Deleting script.dat and other non-core files
- Recompression of save

**Crash details from factorio-current.log:**
Error: ElectricEnergySourcePrototype.cpp:58 → Energy source error, most probable cause is the double entity problem.
Stack trace points to: AssemblingMachine → EnergySource → Chunk::load

**Files attached:**
- `test.zip` (the save)
- factorio-current.log

It seems like a single entity / chunk is corrupted and prevents the save from loading.
Any help would be much appreciated to recover my save!

Thanks!