Cached device in a weird place

As I was explaining to sjanc in #bluez, I've noticed some weird
behaviour regarding some cached device and I think I found one reason
today.
As you can see below, a device called tis9E is found in "devices"
command while I have removed all devices with "remove *" command
previously and not seen this device for a long time.

I wonder now where this comes from.
How such an old device would come back from the dead like that?

Thanks in advance,
Francois.

---

localhost / # bluetoothctl
[NEW] Controller A4:17:31:78:A6:04 Chromebook_0A65 [default]
[NEW] Device C7:78:B4:5F:FA:DF tis9E
[bluetooth]# devices
Device C7:78:B4:5F:FA:DF tis9E

---

localhost bluetooth # more
/var/lib/bluetooth/A4\:17\:31\:78\:A6\:04/C7\:78\:B4\:5F\:FA\:DF/info
[General]
Name=tis9E
AddressType=static
SupportedTechnologies=LE;
Trusted=false
Blocked=false

---

localhost bluetooth # more
/var/lib/bluetooth/A4\:17\:31\:78\:A6\:04/cache/C7\:78\:B4\:5F\:FA\:DF/
more: stat of /var/lib/bluetooth/A4:17:31:78:A6:04/cache/C7:78:B4:5F:FA:DF/
failed: No such file or directory