bug: random multiplayer desyncs with mods [need-info]

might be related to #245, but it's harder to reproduce. i'll just put all the findings here as a memo...

using v0.4.5 + :main/winex:rbgen branch, 2-host 1-person multiplayer factorio-1.1.105

after adding janky-quality mod (=> 41k recipes, yay!), but it might not be the root cause! i'm now getting weird/random desyncs sometimes: it can happen in 2+ hours or like 3 times in a row (after reconnecting, ofc) and their cause i'm unable to track or link to anything for a couple of days already:

~~blueprint editing/pre-placement~~
~~cut/paste/delete bot orders~~
~~opening chests~~

sometimes it's similar to prev. issue, but sometimes random-generator differs in level_with_tags_tick_*.dat:

same: tycoon-house-{1,2}
same: tycoon-excavation-pit-{1,2}
first-and-once: janky-quality.migration-0.1.4.json</prototype-migration-list><next-unit-number> {0xD8, 0xD9} note: this data is after migrations and placed just before <map-mod-settings>..., but idk what it is and had no desyncs before this one.
new: <random-generator>...

looks like something else triggers random_generator() in some unsafe way.

maybe 2+ players can trigger this more frequently (or just hack a fast city growth :P). some more code/flow understanding is required. it seems very strange that even 1-person multiplayer desyncs as i never had it previously with #289 applied - probably that was not enough... :(

mods

patched:

actual-craft-times-remade_1.0.8.zip (my fork: winex:testing)
janky-quality_0.1.32.zip (v+=0.0.100 with simple ... ~= nil; .item fix to load)
tycoon winex:rbgen

full list:

BottleneckLite_1.2.8.zip
ChangeMapSettings_5.0.1.zip
ChunkyChunks_1.5.1.zip
DeleteEmptyChunks_0.4.3.zip
DoingThingsByHand_1.2.2.zip
DoubleSpeedBelts_1.1.9.zip
Noxys_Waterfill_0.4.4.zip
PickerAtheneum_1.2.5.zip
PickerBeltTools_1.2.6.zip
PickerDollies_1.2.6.zip
PickerExtended_4.1.4.zip
PickerInventoryTools_1.1.15.zip
PickerTweaks_2.2.7.zip
SchallUncraft_1.1.0.zip
Warehousing_0.5.7.zip
WireShortcuts_1.1.13.zip
actual-craft-times-remade_1.0.8.zip  ### patched
chunk-aligned-roboports_1.0.0.zip
deadlock-beltboxes-loaders_2.4.2.zip
deep-storage-unit_1.3.5.zip
eradicators-library_4.2.6.zip
eradicators-vram-saver_0.1.7.zip
flib_0.13.0.zip
fluid-memory-storage_1.4.6.zip
janky-quality_0.1.132.zip  ### patched
mining-patch-planner_1.5.8.zip
stdlib_1.4.8.zip
tycoon  ### (winex:rbgen)

label: [question] [help wanted], w/e...

bahrmichael / factorio-tycoon

bug: random multiplayer desyncs with mods [need-info] #292

mods