Bulgaria will invite Dutch and Austrian customs experts to help secure Schengen entry

That is a great move by Bulgaria.

It shows the willingness to cooperate and improve but also calls out the Schengen blocking countries to find flaws at the border.

And even if they find flaws and things to improve on, those might be the path towards getting approval once they are up to the desired level.

Instead of pointing fingers at each others, someone decided to get the fingers dirty, address possible problems and work on things together.