Local site admin cannot “Remove Connection” on multisite

On our WordPress multisite network, when the error message “Please re-grant Google app permissions! Go to WP Mail SMTP plugin settings page. Click the “Remove Connection” button. Then click the “Allow plugin to send emails using your Google account” button and re-enable access.” appears, my local site admins cannot remove the bad connection. They click the Remove Connection button, but it does nothing.

Instead, I as the Network Admin need to click the Remove Connection button to remove the bad connection. Then the local site admin can click the Allow plugin to send emails using your Google account to reauthorize the GMail connection.

This really makes no sense. They are able to go to the WP Mail SMTP Settings page, see the error, and add a new connection. But they cannot remove a broken one. This is on WordPress v.5.4.4, and WP Mail SMTP v.2.3.1.

The local site admins belong to a custom Site_Admin role that has permissions slightly less than a regular Administrator. Their permissions are:

allow_webhook_posts
copy_posts
create_users
delete_others_pages
delete_others_posts
delete_pages
delete_posts
delete_private_pages
delete_private_posts
delete_published_pages
delete_published_posts
delete_users
edit_dashboard
edit_others_pages
edit_others_posts
edit_pages
edit_posts
edit_private_pages
edit_private_posts
edit_published_pages
edit_published_posts
edit_theme_options
export
import
list_roles
list_users
manage_categories
manage_links
manage_options
moderate_comments
publish_pages
publish_posts
read
read_private_pages
read_private_posts
remove_users
restrict_content
unfiltered_html
upload_files