Three Shelly Blu Window/Door sensors, one works perfectly, two keep disappearing from HA

[DJBenson]

Describe the bug
I have an allotment with a couple of sheds which I want contact sensors on. The allotment has WiFi and is covered by ESPHome ble-proxies on ESP32 dev boards. My first shed has a device which I sourced from AliExpress and it's been perfect since installation. I ordered a second unit from Amazon UK and it refuses to "stick" in Home Assistant - on restart it disappears. Assuming this was a faulty unit I ordered a second and it does exactly the same.

To Reproduce

• Wake the device
• Pair to Home Assistant
• Confirm the device is reporting data
• Restart Home Assistant - devices disappear

Additional context
Firmware versions of the devices:

• The original device which is working is on: 20230522-134711/v1.0.6@9b614a29
• The second and third devices which are not working was on the same version but is now on: 20240408-184602/v1.0.16@716b307b (both updated using the Shelly BLE Debug app)
• All have beacon mode OFF.

Home Assistant version data:

• Core: 2024.10.3
• Supervisor: 2024.10.3
• OS: 13.2

ESPHome version data:

• 2024.10.2

Attached screencap of the end to end journey:
https://github.com/user-attachments/assets/405ac2a9-1d8a-491e-9ddf-5cb7045d795c

Debug log:
Removed for now as it seems to contain nothing relevant to BTHome.

[DJBenson]

Some time later they popped up again as discovered devices - they still disappear if added again.

[DJBenson]

So I traced this back to a completely unrelated issue. Another integration had written a corrupt line to the device registry and it made the file effectively read-only meaning ANY integration added disappeared after a restart.

Closing.