I tested MDO with soaking for days and then rapid drying ,after several cycles the lams would start to split from the stress.
But the glue never failed. The extira mdf is a good product and I suspect any problems come from using it the wrong way,it is not for structural use. It's been years since I read the specs for MDO but I think mfgs call for the edges to be
covered not painted. That is seldom done.