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[Notabilis <notabilis27@xxxxxx>]

Sorry for the late response. Currently, these functions are indeed called for all players in parallel within the win condition scripts. But if this would change for whichever reason, the game would desync. A point where this happened are the functions within ui.lua which call the sleep() function in coroutines.lua for only some players. It could happen that a similar construct is created at some time in the future again.
I think the comment in coroutines.lua should be something like:

Do not use these functions in multiplayer scripting (scenarios and
winconditions) for only some players of a game. Make sure they are
called for none or all players in parallel, otherwise the games will
desynchronize.
-- 
https://code.launchpad.net/~widelands-dev/widelands/bug-1811583-desync-with-territorial/+merge/362272
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