Widgets not saving/registering in Network sub-sites only

Hi

I’m developing a multisite install and it’s my first time using Sage.

I have sidebars throughout the theme and while they all work correctly in the Main parent site, the sub-sites don’t appear to be saving any widget data, merely showing default widget content.

The same theme is used for all sites, parent and sub sites, and everything works 100% on the parent site with the same code. Is there anything I need to do to enable sidebars to work on Network sub-sites in init.php?

Sidebars in the widgets page are there, but any widgets placed inside them on a sub-site doesn’t save the widget at all.

Here’s my code:

init.php

/**
 * Register sidebars
 */

function widgets_init() {

   register_sidebar([
    'name'          => __('Footer Col 1', 'sage'),
    'id'            => 'footer-1',
    'before_widget' => '<section class="widget fc1 %1$s %2$s">',
    'after_widget'  => '</section>',
    'before_title'  => '<h4>',
    'after_title'   => '</h4>'
  ]);

    register_sidebar([
    'name'          => __('Footer Col 2', 'sage'),
    'id'            => 'footer-2',
    'before_widget' => '<section class="widget fc2 %1$s %2$s">',
    'after_widget'  => '</section>',
    'before_title'  => '<h4>',
    'after_title'   => '</h4>'
  ]);

     register_sidebar([
    'name'          => __('Footer Col 3', 'sage'),
    'id'            => 'footer-3',
    'before_widget' => '<section class="widget fc3 %1$s %2$s">',
    'after_widget'  => '</section>',
    'before_title'  => '<h4>',
    'after_title'   => '</h4>'
  ]);

      register_sidebar([
    'name'          => __('Footer Col 4', 'sage'),
    'id'            => 'footer-4',
    'before_widget' => '<section class="widget fc4 %1$s %2$s">',
    'after_widget'  => '</section>',
    'before_title'  => '<h4>',
    'after_title'   => '</h4>'
  ]);

        register_sidebar([
    'name'          => __('Footer Social', 'sage'),
    'id'            => 'footer-5',
    'before_widget' => '<section class="widget %1$s %2$s">',
    'after_widget'  => '</section>',
    'before_title'  => '<h4>',
    'after_title'   => '</h4>'
  ]);
}
add_action('widgets_init', __NAMESPACE__ . '\\widgets_init');

…and then calling it in the theme template file:

<?php if ( is_active_sidebar('footer-1') ) : ?>
          <div class="col-sm-3">
        	<?php dynamic_sidebar('footer-1'); ?>
          </div>
        <?php endif; ?>

        <?php if ( is_active_sidebar('footer-2') ) : ?>
          <div class="col-sm-3">
                <?php dynamic_sidebar('footer-2'); ?>
          </div>
        <?php endif; ?>

        <?php if ( is_active_sidebar('footer-3') ) : ?>
          <div class="col-sm-3">
          	<?php dynamic_sidebar('footer-3'); ?>
          </div>
        <?php endif; ?>
        <?php if ( is_active_sidebar( 'footer-4') ) : ?>
          <div class="col-sm-2">
          	<?php dynamic_sidebar('footer-4'); ?>
          </div>
        <?php endif; ?>

        <?php if ( is_active_sidebar('footer-5') ) : ?>
          <div class="col-sm-1 footer-social">
              <?php dynamic_sidebar('footer-5'); ?>
          </div>
        <?php endif; ?>

… as I say, it works great on the main parent site, all widgets update correctly, but none are working on the sub-sites.

Any ideas would be appreciated or if anyone has experienced anything similar, was there a fix?