Just updated to 0.16.20, turned off peaceful mode and have had no desyncs now for a good half hour at least, with multiple pollution-triggered attacks. Seems fixed for me! Thanks devs!

I just tried this, didn't immediately work. Got in again and issued /c game.forces.enemy.kill_all_units() at which point the desyncs stopped

To test some stuff out I wandered around for a while, placed some buildings etc then went and attacked a nest - then the desync hit. Definitely seems to be ...

Just for fun, I tried Windows server => windows client and while I couldn't get a desync to occur, I did notice some *really* weird biter/spitter behaviour.

I engaged a group, they chased after me then after a short distance, they seemed to lose interest, start wandering around in circles then just ...

Is anyone able to test mac client -> linux server and mac client -> windows server?

I'll do both of these right now, stay tuned
EDIT-
I took my known bad map from my main server and copied it to a fresh linux server without mods
Mac client => linux server, desyncs almost immediately (~3-5 seconds ...

The desync involves biters so you'll need at least some of them for it to happen.

I've been able to make this small map (~5mb), generating a small amount of pollution and with biter evolution set to 1, and have had a couple of desyncs now between linux headless and macos client. Desync is still ...

Could some of you try the attached app? To make it smaller, I removed a lot of data, so the game won't start properly, but it should crash later, with a factorio window open and a log file created. The error should say something about 'Unknown key:"font.default"'.

This didn't immediately work ...

When you have a rocket ready to launch, and auto-launch with cargo checked, if you are then to add more than 4 modules of any kind to the silo, the extras overflow into the cargo and triggers the launch.
Ie, if I have a stack of 5 prod 3 modules and ctrl+click the silo to drop them in, four modules ...

TL;DR
Output the 'xx was killed by xx' and 'xx respawned' log lines in the headless server stdout

What ?
In multiplayer, when a player is killed by whatever and respawns, those messages are shown in-game to all connected, but are not echoed out to stdout in the headless server runtime.
Having ...