The data should be loaded with paragraphs, each with different font. Also the image caption should have "changed font" string with different font.
Try to:
The "Restricted value matching" option means that all font-family values that aren't defined in the plugin's configuration will be removed (e.g. when pasted from Google Docs).
This behaviour can be disabled by selecting the "Disabled value matching" option, which sets "supportAllValues: true" in the font family configuration.
The Docs-Roboto, Arial font-family is not specified in the plugin's configuration and should be restored to default font when the "Restricted value matching" option is selected.
By default editor should load with the "Disabled value matching" option.