[Support request] Images default to ‘thumbnail’ when changing from classic to gutenberg

[Jo]

Hi, I have 2 websites with the same issue. When I convert old ‘classic’ posts to ‘Gutenberg’, the images in the post change to ‘thumbnail’. To get them back to their original size, I have to delete the image and re-add it through the media library. I have tried simply changing the image size in each block. It changes in terms of the name but the image shown is still thumbnail. This is site wide across 2 sites, so hundreds of images. I therefore can’t do it manually. I have checked the media attachment size in customise and it is ‘full’ for one site and ‘medium large’ for the other. Is there a fix for this? Thanks!

[David]

Hi there,

he settings in the Customizer > Layout > Blog Are solely for the Featured Images if the theme is displaying them.
it has no control over what WordPress does when convert to blocks, swaps an image out for an image block.

i had a look around to see if there were any other issues like this.The
This is the closest match i found that shows convert to blocks breaking image sizes was this:

https://github.com/WordPress/gutenberg/issues/35050

Not sure its related, but might be worth checking the images HTML.

One thing to try, although i am not sure this will work when converting blocks, is to set the Image Blocks default size to full using this PHP Snippet:

function set_default_image_size() {
    update_option('image_default_size', 'full');
}
add_action('after_setup_theme', 'set_default_image_size');

[Author]

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