Using Factorissimo 3 by notnotmelon, and just placing the factory down causes the following:

Entity is not a known factory.
Factorissimo get_factory_by_entity returns nil.
I can not initialize smart linked chests.

You don't need to report this. I apologize, but there is nothing I can do.
The cause lies outside this mod.
May be removing some other mods could help.

stack traceback:
Kux-SmartLinkedChests/modules/Chest.lua:210: in function 'on_built_factory'
Kux-SmartLinkedChests/events/on_built_entity.lua:13: in function 'fnc'
Kux-CoreLib/lib/EventDistributor.lua:187: in function 'fnc'
Kux-CoreLib/lib/EventDistributor.lua:156: in function <Kux-CoreLib/lib/EventDistributor.lua:150>

Kux-SmartLinkedChests v3.0.16
Kux-CoreLib v3.13.0

Steps to repoduce:
Just place down a factory from the mod.

You don't need to report this. I apologize, but there is nothing I can do.

sorry, like I said, there's nothing I can do
my mod asks the mod Factorissimo and Factorissimo does not return a factory.
so I can not initialize the new factory for chests.

In general, Factorissimo works without any problems
https://prnt.sc/hIi8HVdPKLCS
https://prnt.sc/RxvnBnAfZYEk

does it never work for you or only sometimes not?
does it work with another game?