A very technical and complicated topic I am afraid with regards to pensions.
I worked in Netherlands, Luxembourg, Netherlands again,UK, Luxembourg (again), Hungary and now live in Turkey.
As per rules as I understand the last country where you worked for a full year has to deal with your pension requirements (requirements are different per country), I do not speak Hungarian, but Hungary would have to deal with my pensions (I am a bit freaked out).
I am even considering to take a job in Netherlands (or Luxembourg) (very very simple) in a supermarket (part time) just to be able to communicate myself with pension authorities.
I would say even for specialists this case would be interesting how to serve.
Would you have some experience in Hungary (or elsewhere)
Will be difficult to force people into getting things aligned.