I had the same issue. I couldn’t find a way to solve it without just starting a new project and migrating my files to it - or just importing my files in another project and merging them to this one.
For those who have encountered this problem. One of the reasons is that the size of the model is too small, maybe it is less than one cm. Just enlarge the model in any 3d editor to a realistic scale, freeze the transforms so that the scale is 1,1,1 and export to fbx. I think that will solve this problem.