The problem is not resolved, generally speaking.
It happened to me multiple times. It is very annoying Fusion 360 bug:
When Fusion becomes busy for different reason (auto-saving, calculating, redrawing...) any click on any timeline element causes this element, and everything related to it on the timeline, disappearance. Then, 'Circular Dependence' error pops up. I have no idea why left mouse click on the timeline causes the deletion of the elements or features, but it happens to me three - four times a week. It does not affecting simple models just because the Fusion background actions delay is very short on them, and it is very hard to hit timeline element exactly at the same time. For the real models with multiple bodies and not 'just two spheres and one cubic' geometry, Fusion freezes for 5 - 15 seconds every five minutes or more often for performing auto operations. It is very easy to click on the timeline element exactly at that time and create the mess in your model. Undo helps sometimes in such cases, but most of the time you need to close the design without saving and reopen it again. You will be very lucky if you saved the normal copy recently.
It is very frustrating Fusion 360 modeling, with enabled timeline, flaw.