Re: "the problem was found in testing"
Nothing to do with EMF or 'proper' testing. If they were built without magnetics, the network port doesn't work. At all.
By the way, when I looked last year the lead time for most of those sockets was around 3 months, and it is very difficult to find compatible parts.
They probably got stuck with the bad parts because of supply problems, it could be some time before there is a solution, and somebody has just blown their profit margin.