Issues with image insertion buttons not displaying in posts

I'm not sure if I should report this as a bug, or if it's due to some misconfiguration on my part, or whether it has been resolved in the latest version.

I am currently using version 2.2.13

In the images (attachments) of the post, the little button that suggests inserting it as a full image or as a thumbnail does not appear.



If I insert it manually, the image is displayed as a link.

Any ideas?

EDIT: Same problem in version 2.2.14 too.

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