iOS 16: can group accessories but can't ungroup them
I have multiple accessories exposed for my Roborock: main vacuum as the fan and switches for rooms and pausing. They are all shown as single tiles in the iOS Home app. If I go to any accessory's settings in that app I can tap on "Group With Other Accessories..." 

![image](https://user-images.githubusercontent.com/6009806/210139626-9b39d15b-29fc-40ea-912f-f35a6e674c23.png)

and group some of these together. However, it's then impossible to fully ungroup them. A minimum of two accessories will always remain. Inside the group, each accessory's settings is supposed to have an option to be removed from the group, but the roborock accessories don't have that option. 

![image](https://user-images.githubusercontent.com/6009806/210139639-dfd985d7-049d-4990-90f5-b3969838e87e.png)

You can still untick them in the group settings and this remove, but as I said at least two must always remain. 

 
Spent a lot of time with a senior Apple support advisor, but they could not solve it and expressed the opinion that even if I raise this with Apple engineering they are likely to reject the issue as it's a non-certified accessory. The advisor confirmed that the option to remove from the group does exist on compatible certified switches that he tried. 

The workaround here is leave in the group only two accessories that you can disable in the homebridge roborock plugin settings, then disable them, then the group disappears, then re-enable the accessories. 

# Versions
iOS 16.2

homebridge-config-ui-x v4.50.2

Node.js Version	v16.18.1

homebridge-xiaomi-roborock-vacuum v0.28.1

Vacuum Model : roborock.vacuum.s5e, Firmware Version : 4.1.2_1662, Plug-In Version : MI_MDX_2774