Hey,
The issue is that Shortcake is getting confused when editing a wysiwyg inside the ACF Options Page. Everything still works, but Shortcake shows the message “Something’s rotten in the state of Denmark” instead of the actual shortcode text.
I know Shortcake is the culprit here.
I wanted to see if anyone has encountered this and built a workaround.
I found the spot in Shortcode that creates the issue here: https://github.com/wp-shortcake/shortcake/blob/master/inc/class-shortcode-ui.php#L436
It’s checking to see if the current user can edit the current post, but since it’s not a real post it gets confused.