Image_list option not working

[DAN-IVI]

Hi,
We are using your bundle in a project and would like to be able to use the image_list option but I can't seem to make it work.
I send a variable to my TWIG template called 'tinyMCEimageList' and I initiate the bundle using:

{{ tinymce_init({
        image_list: tinyMCEimageList
    }) }}

When I do the same using Firefox console, I have the list of images which appear.
Am I missing something or is there a bug? I'm using version 1.0

Best regards,
Daniele