Home Assistant Config Helper in VSCode shows entities, but schema support is not there (Windows)

I set up the VSCode extension Home Assistant Config Helper (V1.39.0)

I am able to connect to my HA server, and I can browse my entites. However, when I open the config-folder I do not have schema support, there are no checks regarding correct attributes, no meaningful code completion (just !env_var and some more starting with !).

It does not matter if I open the folder from my Raspberry Pi or directly from my Windows PC locally.

The log says:

[Home Assistant Language Server(26940)] Started and initialize received
Connecting to Home Assistant...
[Auth phase] Initializing WebSocket connection to Home Assistant
[Auth Phase] Connecting to Home Assistant... Tries left: 3
Applying schemas to 5 of your configuration files...
Assigning c:/Temp%5Cconfig%5Cconfiguration.yaml the configuration.yaml schema
Assigning c:/Temp%5Cconfig%5Cautomations.yaml the configuration.yaml/automation schema
Assigning c:/Temp%5Cconfig%5Cautomations.yaml the configuration.yaml/automation schema
Assigning c:/Temp%5Cconfig%5Cscripts.yaml the configuration.yaml/script schema
Assigning c:/Temp%5Cconfig%5Cscenes.yaml the configuration.yaml/scene schema
Schemas updated!
[Auth phase] Received a message of type auth_required
[Auth phase] Received a message of type auth_ok
Connected to Home Assistant

The path in the lines starting with “Assigning” looks quite strange (c:/Temp%5Cconfig%5Cconfiguration.yaml), maybe this is the reason?

Any ideas?