Fancybox not working in block editor images

Hi, look at the two top images, fancybox is not working

the 3rd images etc is working .. it is using classic editor. We are planning to change it now in block editor but the fancybox should still work.,.

I tried to check the settings -> media it seems they are ok.. also the images on top are jpg so it should autodetect.

I hope you can help me, it’s been a week since we still trying to know the problem

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