Ok my take on this mat!
I’ve used it a couple of times in August as it was specified by Porcelanosa and supplied direct to the customer ie. we were labour only!
In my opinion it’s just a roll of stiff J cloth type material that we stuck using their butech adhesive and weight rolled for complete adhesion.
Plank tiles were then fixed and grouted - all butech products.
On completion and within a month I noticed some grout missing, added more additive to grout as supplied and touched up. I showed the builder my concerns with their specified materials and he is aware of the possible outcome.
IMHO this matting is a waxy type surface layer that does not encourage a satisfactory bond with the tiles - so this OP thread is of no surprise to me and I envisage an awful lot more issues in the future.
To elaborate on
@Dan post about the Dural failure of a few years ago - their popular decoupling membrane is a 2 part roll that uses an adhesive technology to weld the 2 layers together. A batch manufactured over a 3 month period failed and to their credit the German manufacturers settled every claim that was brought to their attention.
However like this issue now with the Butech matting the Tiler gets the blame first, guilt and responsibility sets in and without notification and support he offers to replace the failure at his expense.
On the Dural situation I knew I had done everything correct so stood my corner and after a short delay received a substantial compensation payment for the customer which allowed for redoing the floor and something for their inconvenience .
I have a roll of Butech mat from the August project which I was going to skip ( not a product I have any confidence in using again) but I shall now keep in case of future testing!
John