I modified a woodland mansion a significant distance away from the world origin, with the intention of needing to reset it by cloning it to a position closer to the world origin. I initially made a mistake in typing in the coordinates in the command block which would reset the structure, resulting in a small portion of it being clipped off. It took about 60 seconds for it to load.

I managed to fix it, but then some odd things started happening. I was playing in multiplayer split screen in order to load to load the location the structure is built, and where it needs to be cloned. When I cloned the structure with the fixed commands, it did not load. However, the command block was very clearly powered, with repeaters facing it powered on. However, the repeaters were only powered by a pulse, one that should have ended.

I flew around and noticed that my alternate player was still near the command blocks. However, from that players point of view, it was not, it was flying over where the structure was built. I flew it over to where my main account saw it, and it saw my main account in the same position and pose as my main account saw it. I broke and placed some blocks using both accounts, and they did not see each other's changes. I decided to exit the world and log back in, as the structure had still not finished cloning. I exited, and it took about five minutes to save, which was unusual because it normally takes less than thirty seconds(this was on an Xbox series x).

I came back in, and the structure had finished correctly cloning. However, It cloned over where the command block was, due to me not thinking about how close the two were. I rebuilt the command block in another location, and tried again, with similar effects, however, I did not notice the bug with accounts not seeing each other. I again exited out, which took around five minutes, and came back in, to find it successfully cloned.