Context Menu: Dropdowns do not load

[PinkyFooFoo]

When you open the Context-Menu of the command-node, the Dropdown for the Command does not get injected with the List of avaiable Commands. The reason for that can be found in the console:

Refused to apply style from 'http://[server-ip]:1880/miio-roborock/static/css/multiple-select.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
:1880/#flow/bc3b4723.0afcd8:1 Refused to apply style from 'http://[server-ip]:1880/miio-roborock/static/css/common.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
:1880/miio-roborock/getCommands?nodeID=b6242f56.5dbe8:1 Failed to load resource: the server responded with a status of 404 (Not Found)
:1880/#flow/bc3b4723.0afcd8:1 Refused to apply style from 'http://[server-ip]:1880/miio-roborock/static/css/multiple-select.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
:1880/#flow/bc3b4723.0afcd8:1 Refused to apply style from 'http://[server-ip]:1880/miio-roborock/static/css/common.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
:1880/miio-roborock/getCommands?nodeID=b6242f56.5dbe8:1 Failed to load resource: the server responded with a status of 404 (Not Found)

Relates to v2.2.2
Bug found in FF.latest, Chrome.latest
Node-Red v1.2.9 (windows)

[PinkyFooFoo]

It seems that the routes are not present.

Calling
http://[server-ip]:1880/miio-roborock/getVoices or
http://[server-ip]:1880/miio-roborock/getCommands [...]

aswell as the static-Files result in a
"Cannot Get" error.