Today I experienced for a second time a creepy switching to another Space.
For testing a bug I changed to my test Space that contains an old copy of my main Space.
They differ meanwhile in some aspects - I was definitely in my test Space.
After converting there a Set into a Collection, I’ve found in the Flow of this new Collection many unwanted Links, also a link to such a strange nameless Object as described in the start post.
I didn’t open this Object this time, simply hovered the mouse over it, then I did some other things. For example I deleted the new Collection.
At some point I suddenly recognized that I was back in my normal main Space!
Creepy!
I clearly did not have had any intention to switch from my testing Space back to my normal one!