Surveying a building with one AP where the clients complained of unusual bad WiFi, I noticed that a Rescue Me-134150 SSID was being broadcast. Eventually i traced it to our own AP. It is a Z7372 connected to a ZD3000. Mesh is turned off on the ZD and AP. There was no alarm or evidence of any kind that the AP had any issue. All the WLANS assigned to the group that the AP was part of, were being broadcast correctly. The rescue me SSID seemed to be present only on the 5 GHz spectrum.
I ended up rebooting the AP and issue went away.