Mismatched serialization in the builtin class 'Mesh' after porting project from 5.4.6 to 2017.03

Some meshes appear invisible in WebGL, Android and iOS builds when this error appears. One workaround that we found is setting mesh compression setting to medium for broken models. The error gets thrown when asset bundles are being loaded. We assume there is a problem in serialization but can't be sure. In the forums the problem seems to have been present in Unity 4.x. Any ideas of how ti fix this project-wise without hunting for there models?

Ps.: Tried reimporting assets, deleting Library folder