I spoke too soon. It is still crashing.

Okay after ready 123606 I scoured my save for any blueprints with the starter hub in them. I found two. Deleted them both and now I'm able to autosave again.

Oh is this:

123606

?

This is repeatable on two different machines.

Mac log:

0.001 2024-12-07 20:30:20; Factorio 2.0.23 (build 80769, mac-arm64, steam, space-age)
0.001 Operating system: macOS 15.1.1
0.000 Initializing Steam API.
0.001 Program arguments: "/Users/daniel/Library/Application Support/Steam/steamapps ...