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It’s not the first time I report this issue but, I just tried again with a new theme and I see the same issue: images uploaded within a post have no height and width automatically added (can be done manually though). The Featured Image has no problem there.
I know, that was the case until the last Publii update when this behavior stopped, I don’t know why but it’s happening on all the websites I operate. I also tried with different options (with or without lazy loading, etc. to no avail).