I have just had the same issue reported by one of our clients. This file caused their project to crash whenever they tried to link it. When opening the file, the startup view (drafting) showed up fine, but when opening any other view, Revit would crash. The client was running Revit 2019.2.1 (latest update).
Strangely, I had no problem opening or changing views in the same model on my computer (exact same Revit version). I tried creating a new version of the model, by placing a 3D view on an empty sheet, and "Save to file..". Just the same as suggested elsewhere in this thread. Revit would not save the model, and gave me the same warning as well "The fabrication model attached to file could not be saved".
Time for a workaround... Selecting all geometry in the model, and trying to create a group, with the intent of saving the group as a model. Now Revit warned me that some elements could not be grouped, and provided me with the ID-numbers of those elements. The elements were identical to many other elements in the same model (a structural column and a steel beam / structural framing).
I replaced the elements with identical ones, and tried grouping again - no problem. I tried saving the 3D view as a new file - no problem, no warnings.
I send the modified file back to the client, and everything seems to work. Of course YRMV, but I hope this at least can push you in the right direction.