I am totally new to WP, ACF Pro and clone. I am new to Sage 9, as well, but I have worked with Laravel, which makes Sage somewhat familiar to me.
My boss has told me that I have to use “Clone” within an ACF thing that I have created, because he wants me to reuse the flexible content that he has already created, which makes sense to me. The following is a screen shot:
have_rows('wysiwyg') should be have_rows('all-flex-fields-mission-layout')
I’m sure you already checked this out, but I think the documentation for ACF Flexible Content will help clarify this. Carefully compare the field names in their screenshot of the settings page to the examples.
Maybe this has something to do with why it is not showing up. In the page “Mission,” the wysiwyg is showing up as the clone’s original name “Basic” - do you think that has to do with why “mission-wysiwyg” is not showing up? Please see the following screen shot