this is currently very mind-boggling to me. But maybe I’m getting something wrong here.
I have a folder A on device 0 that I share with device 1. After I have done that, I also have folder A from device 0 on device 1.
If I then share folder A1 (that’s folder A on device 1 that came from device 0) to a device 2, I have folder A also on device 2.
If I then change the folder A2, is the change first propagated to A1 and from A1 to A0, or is the state global, so that 0 and 1 get the change pushed directly from 2.
Well. Device 0 shares the folder with device 1. Device 1 then shares this folder with device 2.
This means devices 0 and 2 are not connected directly.
So guessing from your question, I would assume that the change on 2 first propagates to 1. Since 1 has the folder shared with 0, the change from 2 indirectly propagates back to 0.
