A mining depot on a many hour MP game had a recipe set for mining an ore and drones in it. The ore had become all mined up while player1 was on the server and the no ore within range alert was going off. When player2 joined the server they got a desync (linked below). Player 1 removed the recipe on the mining depot and then player2 could rejoin.

Using Factorio 0.17.79 and Mining Drones 0.1.14
There are many other mods on the map, all can be gotten by syncing with the save.
https://www.dropbox.com/s/48odgr77ujpprnl/Mining%20Drones%20Desync.zip?dl=0

hmm some time later player3 joined and had the same issue, but we had no alerts up at the time. The deync reports do look like its the mining drones that have the game state variation though :s

SHould be fixed, it was related to Serpent and cyclic references

Oh really :( are there any details on exactly what else to avoid with Lua tables on top of the n usage of:. t[#t] = thing