My friends and I have been playing a multiplayer Rampant world without Space Age, and the moment we launched our first mk1 orbital ion cannon, we've started to have constant desyncs. Here's two desync reports, one that happened the moment it was launched, and another from a minute or two after everyone resynced.
https://drive.google.com/file/d/107TggF0oQ34DDA5QhFVBWZXWBoQAFShA/view?usp=drive_link
https://drive.google.com/file/d/18LrVM2s-y8u5ruxjey2weqR5VMjUbAPB/view?usp=drive_link