Configuration/adding devices crashed HomeAssistant


Intel NUC computer.

## Describe the bug

HomeAssistant crashes completely when doing this:
- Adding the integration first time (not HACS download, but setting up after reboot)
- Changing area/name of any bluetooth proxy (changes made, but still crashes)
- Adding a device (the devices is added, so shows up after reboot)
- Removing a device
- Downloading diagnostics creates a crash too.

Only thing I could do without a crash so far was to uninstall the integration.

Started with version 0.7.4 and started crashing from the beginning. I upgraded to 0.8.0-apha.2 and it still had the same error.

Uninstalled completely.

Now I was able to rename and put areas to bluetooth devices(proxy and builtin transmitter)

Installed 0.7.4 again and had the same issues.

HomeAssistant is not available for quite some time after each crash, takes a few minutes. Much longer than a normal reboot

Changed max velocity to 4m:

## Diagnostics

Unable to download as HA crashes. It might be possible to retrive the file after reboot from SSH but I don't know where the generated files are store and if they will survive a reboot.

I have enabled debug logging, but when disabling debug logging for the integration after restart I only get a log from after reboot. So it contains nothing special.

I have tried to disable the built-in bluetooth device on the integrations/bluetooth page, but that does not help anything. Other bluetooth proxy is ESP32/ESPhome managed from ESPHome add-on. Nothing special.
Update: disable the built in bluetooth device allowed me to update global configuration without a crash. But adding a device still crashes.