get_post_gallery_images() Does not return images if the gallery shortcode has type="slideshow"

[MaFt]

Using does not return anything if the gallery shortcode includes ' type="slideshow"' - removing the type allows it to work. But this means not being able to use slideshows for galleries.

[joyously]

The core gallery shortcode does not handle a type parameter, but having one should not affect the output.
​https://developer.wordpress.org/reference/functions/gallery_shortcode/
However, the gallery shortcode handler can be bypassed by a plugin using the 'post_gallery' filter.
Please retest without plugins, to isolate the core code.

for reference, the ​get_post_gallery_images function

[MaFt]

Ah, it looks like it is Jetpack that adds the 'type' dropdown option to the WordPress Gallery insertion page.

The 'type' parameter does, definitely, affect the get_post_gallery_images and get_post_galleries_images functions.

Removing Jetpack from the client's site is not an option sadly. I'll just have to try find another way to get the images. I can get the list of IDs from post_content so will just have to filter that and use another function.

I'll see if I can find a way to report to Jetpack that their code is interfering with core WP functions.

Thanks