echo wp_get_attachment_image( $svg_id, [78, 78], true, [
     'class' => 'img-fluid',
     'alt' => 'icon',
] );

add_filter( 'wp_get_attachment_image_attributes', 'wwc_fix_direct_image_output', 11, 3 );
function wwc_fix_direct_image_output( $attr, $attachment, $size = 'thumbnail' ) {

	// If we're not getting a WP_Post object, bail early.
	// @see https://wordpress.org/support/topic/notice-trying-to-get-property-id/
	if ( ! $attachment instanceof WP_Post ) {
		return $attr;
	}

	$mime = get_post_mime_type( $attachment->ID );
	if ( 'image/svg+xml' === $mime ) {
		$default_height = 100;
		$default_width  = 100;

		$size = image_downsize($attachment->ID, $size);
		
		if (is_array($size) && sizeof($size) >= 3) {
			$attr['height'] = $size[2];
			$attr['width']  = $size[1];
		}
	}

	return $attr;
}```