I’m replying to this thread because I’m having a similar issue. When I enter the following WPSP shortcode into a Gutenberg shortcode block, it works. The problem: the next time I edit the page with that shortcode, Worpdress/Gutenberg converts/escapes the ampersands from “&” to “&”
I can circumvent the issue by entering the shortcode directly into editor as a text block. I’d prefer not to do this, since managing a page is easier/cleaner when its shortcodes are in shortcode blocks.
Note: I’m not using GP “sections” — only GP and WP Show Posts.