Woocommerce product gallery thumbs cropped to 100px

Hello, I have an issue with thumbs showing as 100px in the product gallery on the single product page. I tested with both storefront theme and 2022 theme and they both used thumbnail images of 150px which matches the thumbnail settings in I have WordPress. So, it seems somewhere GP is setting them to 100px.

If I use the following snippet it shows the images at 300px.

add_filter( 'woocommerce_get_image_size_gallery_thumbnail', function( $size ) {
return array(
'width' => 300,
'height' => 300,
'crop' => 0,
);
} );

The really strange thing with this snippet is that it does not matter what image I set for width/height, it straight away displays images as 300px. If I regen thumbs, it will regen the new size if I set a custom size with the above.

If I use the following snippet, I can use the "medium" image size set in the WordPress media settings, which is what I am doing for now. Alternatively, if I set the below to "thumbnail" then it uses the Worpress thumbnail size in WP media settings.

add_filter( 'woocommerce_gallery_thumbnail_size', function( $size ) {
return 'medium';
} );

Do you know why GP does not respect the WP media thumbnail settings by default? I have read threads with other users with these issues (see here) and GP support has indicated that GP does not set this, which is confusing as it must if it goes back to the media settings when testing base WP themes.

Maybe I am missing a setting somewhere? Note I have checked the customizer and the WP media settings already.

Hopefully, you have an idea, as it is not ideal to use a snippet to work around the issue.

thanks