Based on many user reports of this behavior it seems that cloud rendering assemblies was broken with he last update.
Hello
This is still a permanent problem for some cases within the 360 fusion, I have not yet found elements for a definite explanation.
I would indicate for this case to work with local renderings so you can get a result.
I worked on this case previously you can follow more about it here:
https://forums.autodesk.com/t5/fusion-360-design-validate/render-moving-parts/m-p/7953378#M156705