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Go to Settings > Privacy
Select a different random page
Save.
Click on review link
Go back to Settings > Privacy
Select your actual privacy page.
Save.

Now it should say:
Successfully saved your privacy policy… bla bla

Creating a new privacy policy using the “Create page” on the privacy page.
Copy the content into that page from my existing policy.
Save & Publish
Trash the old page
Delete permanently old page
Change permalink of new policy page…

File wp-admin/includes/misc.php includes the following code:

	/**
	 * Output a warning when some privacy info has changed.
	 *
	 * @since 4.9.6
	 */
	public static function policy_text_changed_notice() {
		global $post;

		$screen = get_current_screen()->id;

		if ( 'privacy' !== $screen ) {
			return;
		} 
		?>
		<div class="policy-text-updated notice notice-warning is-dismissible">
			<p><?php
				printf(
					/* translators: %s: Privacy Policy Guide URL */
					__( 'The suggested privacy policy text has changed. Please <a href="%s">review the guide</a> and update your privacy policy.' ),
					esc_url( admin_url( 'tools.php?wp-privacy-policy-guide=1' ) )
				);
			?></p>
		</div>
		<?php
	}

I think this is a bug as the ID cannot be a text:
if ( ‘privacy’ !== $screen )

Regards

Zulok