My experience is with just natural cork, I used it to sound proof a music recording studio!
We had the bad idea to put it as finish floor, after few months was totally degraded, was crumbling in a sticky powder that almost killed some of the equipment!
I don’t know if this will apply to your material as well!
P.S.
on the wall was more or less fine, I think that just can not withstand rubbing and wear from walking!
Was it attached directly on the wall or on a kind of floating stud wall? I’m not sure that is the correct terminology for iit but I read that to make walls soundproof you have to suspend them?!
Reason I ask is my secondary purpose for using cork on walls is also to improve soundproofness.