A few days ago there was a post from a forum member who was having an issue with his Z, he sent it in to Nikon along with his FTZ.
A couple of weeks later his camera came back with a note from Nikon that the fuse in the FTZ was replaced thus fixing his issue.
A couple of members including me was skeptical that the FTZ had a fuse, thought it was just a "dumb" adapter connecting the contacts from an F mount lens to a Z body.
Before we all get too hung up on this, it should perhaps be noted that the original report came from a brand-new DPR member, who hasn't had the opportunity to build up any credibility here, and hasn't given us any idea of his/her experience level to help us assess whether he/she can tell if what Nikon told him/her is likely to be correct.