wp_get_attachment_thumb_file looks for $imagedata['thumb'] but wp_create_image_subsizes doesn't create this array entry

[markhowellsmead]

This has come up at ​https://github.com/WordPress/gutenberg/issues/33789. Calling get_the_post_thumbnail without the size parameter, or with the size parameter set explicitly to post-thumbnail (but not thumbnail), returns the full-size image. This is because wp_get_attachment_thumb_file looks for the array key thumb in the attachment metadata, but wp_create_image_subsizes doesn't generate it.

[joyously]

Amazing that this has been there since version 2.1. I wonder if there is another ticket for this?
The standard sizes are listed in get_intermediate_image_sizes().

$image_sizes = array('thumbnail', 'medium', 'medium_large', 'large'); // Standard sizes

yet wp_get_attachment_thumb_file() checks for ['thumb'].

[SergeyBiryukov]

Hi there, welcome back to WordPress Trac!

Thanks for the ticket, we're already tracking this issue in #17262. Also related: #33959.