What did you do?
I have spoofed the updater.factorio.com DNS record in my LAN to point to a different IP address - with a "fake" update server that serves a modified latest update (2.0.27 to 2.0.28) with a completely different content.

What happened?
Factorio connected to my fake update server ...

There is one mystery. In 1.1.1 I had a spidertron kill squad (one "leader! with remote and three other that were set to follow him [yeah, one of them is a "healer" with repair kits and bots]). When I load this save in 1.1.2, the followers are gone, there is only the "leader" spidertron. If I load ...