It solved the problem for me, to be able to proceed and now the model is ready for 3D printing, maybe few aluminium parts will be send for manufacturing, they are simple parts and will be send as STEP file anyway so that will be fine. This is the second proof of concept of 360 video drone. Below is the first one, on that the frame was completely hand build

There was some serious problems with that, but many things learned
https://vimeo.com/426557451
It is very unlikely that any of the parts on current model will go to production, but some ideas and experiences might end to future product. the 3D modelling I do is just mandatory step to build the proof of concept, that is where my focus is and it bugs me that the 3D modelling tool takes so much attention.
I do not quite understand what the Fusion 360 is, who are its intended customers. What I hear professional 3D modellers do not use it. There would be plenty of customers that need some tool for 3D printing and basic design needs like I, but the Fusion 360 clearly is not for them, it has too complex concepts.
It works fine as very basic tool as I use it, until the model breaks up because I used it "Wrong" I just used basic tools for 3D modelling, so I do not think it is acceptable that the model just breaks because the customer was using the tool "Wrong". (Would you be fine if MS Office would destroy your work because you used too much copy/paste, and what is "Wrong" anyway in using copy/paste.)
The solution for me seems to be saving occasionally as STEP to clean the crap from the models, that is the unused sketches and timeline and maybe something else that is under the hood. Maybe I just completely should start using STEP as saving format and manage the files locally, a bit inconvenient with Fusion 360 as it is now, but really the functionality I would prefer, to have the files locally.
So I do not really know for who the Fusion 360 is for. I am starting to think it is inexpensive or free alternative for students, to teach them Autodesk 3D modelling concept, with main purpose to get them using Autodesk products in future, so sad, it could be ok product, now it feels like a proof of concept.
Oh well, there was just a new update, lets see what new problems it brings.