I see that in places efforts have been made to remedy insulation, possibly at the time of installation. Most probably someone who didn’t have our understanding was just doing their job. What you have photographed is all too normal.
Make sure that any insulation over the airtight layer is as least double the thickness of what is below, otherwise you risk the membrane getting cold and condensation forming on the inside, soaking into insulation and timber. A vapour permeable barrier over the insulation will minimise wind washing and clogging of air pores in the insulation.
See also