Hi EnzoD,
I tried to create a custom content type inherited by Article Page, however, after created the page, the rating for the page is available.
I would suggest you can try to create a new Pages library and then test if it works. If the issue still exists, I would suggest you can provide more detailed information, such as screen capture and SharePoint Build version.
Also, please check ULS log for more detailed information. You can use ULSViewer to check log more easily.
ULS Viewer
Thanks
Best Regards
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