Featured image size not working

Hey all, I’m trying to build a Wordpress loop of my posts but I want to use smaller-size images as preview. Right now, I can only build it with the default Featured Image data source:

Schermata 2022-08-15 alle 11.13.08

That works, but as soon as I choose one of the others (SM, MD, LG or even Full) they just don’t appear, and leave the PlaceholderImg instead. Like this:

I tried to switch to data source URL and use one of the short codes, but they also don’t work. I outputted them to my page to see what they get turned into, and this is what I get:

%WP_thumbURL%: https://cirocontinisio.com/wp-content/uploads/2015/02/Tobii3.png
%WP_thumbSmURL%: https://cirocontinisio.com/wp-content/themes/ciro/img/placeholder-image.png
%WP_thumbMedURL%: https://cirocontinisio.com/wp-content/themes/ciro/img/placeholder-image.png
%WP_thumbLgURL%: https://cirocontinisio.com/wp-content/themes/ciro/img/placeholder-image.png
%WP_thumbFullURL%: https://cirocontinisio.com/wp-content/themes/ciro/img/placeholder-image.png
%WP_thumbTitle%: Tobii3

So as you can see the full size image is there (but only if using thumbURL, not thumbFullURL!) and its name. But the others are left on the placeholder-image.

PS: I double checked, the images are on the server, they are in the DB, and if I install another WP template, it can correctly retrieve the smaller size thumbs. So I don’t think it’s a setup issue.

Blocs bug, Wordpress issue, or am i doing something wrong? Thanks in advance!

Bump. Does anyone have thoughts on this? My site went live, but as you can see it’s quite heavy due to this issue.

Thanks!

Bumping up one more time. Any idea?