Why do false positive uploads into ADC happen?

Does anyone get false positive uploading into Alexa Developer Console?

This is where you upload your skill to ADC, and it succeeds, but when you open it, it doesn’t really do anything except flashing the blue light without saying anything. Does this have anything to do with ADC backend? Or is it a communication issue between VF and ADC? Or something else?

My workaround to fix this is to first upload a simpified dummy version of my skill (e.g. one speak block), open my skill, then reload the full version of my skill with the right linkages.