33558.244 Info AppManager.cpp:303: Saving to _autosave1 (non-blocking).
33558.269 Info AsyncScenarioSaver.cpp:177: Saving process PID: 2384
33559.781 [2384] Warning WriteFileGuard.cpp:52: Writing /home/container/saves/_autosave1.zip failed; previous version (if any) should still be available
33559.794 Error AsyncScenarioSaver.cpp:212: Saving failed: The mod LTN Combinator Modernized (2.2.7) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event LTN_Combinator_Modernized::on_save()
Cannot serialise lua functions
33559.810 Error AsyncScenarioSaver.cpp:212: Saving failed: The mod LTN Combinator Modernized (2.2.7) caused a non-recoverable error.
Please report this error to the mod author.

I had a LTN Combinator open and was editing a network. More specifically I had the signal select dialog open looking for an icon to give to the network when, according to the logs, and auto save triggered. Game immediately errored.

I replicated it. Seems you only have to have the edit network dialog open. https://i.imgur.com/8G6Okck.png

In SP you can continue and all is fine but a dedicated server quits immediately.