Broken image in Discourse (but they work in the message preview)

Hi,
When I publish a WP post to Discourse, the images won’t show up:

But they do show up in the message preview if I edit the topic.

Saving the edit or rebuilding the message HTML don’t fix it.
Typical HTML of such an image is:

<img class="wp-image-157219 size-full aligncenter" src="http://monocycle.info/wp-content/uploads/2018/06/catégories-e1529598284988.png" alt="" width="400" height="364" />

Any idea?

edit: I may have understood why.
The domain monocycle.info has been locally redirected to the server I’m working on, which is where my WordPress is installed. I did the redirection via the hosts windows file.
But Discourse doesn’t have this redirection, so I guess it has to read these images URLs by itself before somewhat delivering them on the message, and so it can’t find these image?
Not 100% sure this is the cause, but since my website will be launched in a few days, I’ll figure out when the domain will be globally redirected to my server.

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