Here is a way to help to isolate the plugins.
The dump file created by Cubase it can be loaded into a Visual Studio community edition.
Then we will see the list of DLL-s or modules loaded. Easy to find which ones are from VST directories. What I did, I started to move (temporarily steal) those DLL-s, until I was able to load the project in Cubase 10. Normally there are not too many combinations by which we have to try to load. At the end you will know exactly which plugins are affected. Eventually, you can replace those with others.