I'm having this exact same issue. I only have a single Range Extender 7 that I got when I was first building out my mesh and needed it for coverage. I don't really need it anymore, but keep it in an area where the mesh density is the lowest. I decided to update the firmware from 1.3 to 1.5, which caused the device to drop off Hubitat. I'm somewhat used to this, many Zooz devices do the same. In fact, I just updated 6 Zen30s and used the zwave replace feature, which I didn't know about until I read this, to reset them and then rejoin them to HE without losing anything.
But the zwave replace did not work for the RE7. No matter what I did, the replace would time out when trying to reinclude the device. But, since it's just a range extender it's not like I have any automations with it, so I force removed it and then factory reset it. It's been sitting on my counter, unplugged, for several days now.
Trying to remove it through zwave details just produces
sys:1 2022-07-17 11:10:10.516 pm Failed node 25 remove status: 0 SDK failure node is no longer in failed node list
In the log. I do have a Zooz USB stick. I suppose I'll need to dig it out and figure out how to use the PC controller again. I may not even reincude the repeater in the network. But I still need to figure out how to get rid of this ghost.
