Escaped Output After MB Blocks 1.5.0 Update

Thank you for looking into this. The price field is just a regular text field. Here is the code:

$meta_boxes[] = array(
		'id'              => 'twt-product-modules',
		'title'           => 'TWT Product Modules',
		'type'            => 'block',
		'icon'            => 'editor-table',
		'category'        => 'layout',
		//'context'         => 'side',
		'render_template' => get_stylesheet_directory() . '/blocks/twt-product-modules.php',
		'supports'        => array(
			'anchor'          => true,
			'customClassName' => true,
			'align' => ['full','wide'],
		),
		'fields'          => array(
			array(
				'name'          => '',
				'id'            => 'modules',
				'type'          => 'group',
				'clone'         => true,
				'sort_clone'    => true,
				'collapsible'   => true,
				'default_state' => 'collapsed',
				'group_title'   => '{name}',
				'fields'        => array(
					array(
						'name' => 'Name',
						'id'   => 'name',
						'type' => 'text',
					),
					array(
						'name' => 'Price',
						'id'   => 'price',
						'type' => 'text',
					),
					array(
						'name' => 'Button Label',
						'id'   => 'btn_label',
						'type' => 'text',
					),
					array(
						'name' => 'Module URL',
						'id'   => 'btn_url',
						'type' => 'text',
					),
					array(
						'name' => 'Image',
						'id'   => 'img',
						'desc' => '472 by 306 pixels',
						'type' => 'single_image',
					)
				),
			),
		)
	);

<?php
$attr = $attributes;
if ( empty( $attr['data'] ) ) {
	return;
}
// Assign anchor if available 
$id = $attr['anchor'] ?? '';

// Custom CSS class name.
$class = trim('twt-product-modules ' . ( $attr['className'] ?? '' ));

if ( ! empty( $attr['align'] ) ) {
	$class .= " align{$attr['align']}";
}

if ( ! empty( $attr['data']['modules'] ) ) {
	?>
	<div<?= empty($id) ? '' : ' id="'.esc_attr($id).'"'; ?><?= empty( $class ) ? '' : ' class="'.esc_attr($class). '"'; ?>>
        <ul class="row twt-product-modules-row">
            <?php
            foreach($attr['data']['modules'] as $module) {
                ?>
                <li class="col-3 col-t-4 col-m-6">
                    <?php
                    if(empty($module['btn_url'])) {
                        ?><div class="twt-product-module"><?php
                    } else {
                        ?><a href="<?= $module['btn_url']; ?>" class="twt-product-module"><?php
		                }
                    ?>
                    <?= wp_get_attachment_image($module['img'], 'medium_large', false, array('class' => 'img', 'alt' => '')); ?>
                    <div class="content">
                        <h3 class="name"><strong><?= $module['name']; ?><?php if(!empty($module['price'])) { ?>:</strong> <?= $module['price']; ?>
                        <?php } else { ?>
                            </strong>
                        <?php } ?>
                        </h3>
                        <?php if(!empty($module['btn_label'])) { ?>
                        <p class="btn-c"><span class="btn small"><?= $module['btn_label']; ?></span></p>
                        <?php } ?>
                    </div>
                    <?php
                    if(!empty($module['btn_url'])) {
                        ?></a><?php
                    } else {
                        ?></div><?php
                    }
                    ?>
                </li>
                <?php
            }
            ?>
        </ul>
	</div>
	<?php
}

Also, on a different site, I just ran into the same issue after upgrading to MB Blocks 1.5.0. A \ is added before $ signs. But this time, in my block render callback function. It affected my JS code that is included in the render_callback function (see below for how it added \ before $). After downgrading to MB Blocks 1.4.2 the \$ were no longer added.

<script>
            jQuery(function(\$) {
                let hccf_dtable = \$('#households-table').DataTable({

Let me know if you need more information.

Hi Peter,

Thank you for your patience with my reply, I just created a fresh WordPress install and added MetaBox and MB Blocks 1.5.1.
Then, I added the code below (as a custom plugin) to set up a simple metabox display:

function twt_metabox_io_blocks($meta_boxes) {
	$meta_boxes[] = array(
		'id'              => 'twt-product-module',
		'title'           => 'TWT Product Module',
		'type'            => 'block',
		'icon'            => 'editor-table',
		'category'        => 'layout',
		//'context'         => 'side',
		'render_callback' => 'twt_render_product_module',
		'supports'        => array(
			'anchor'          => true,
			'customClassName' => true,
			'align' => ['full','wide'],
		),
		'fields'          => array(
			array(
				'name' => 'Price',
				'id'   => 'price',
				'type' => 'text',
			)
		)
	);
	return $meta_boxes;
}

function twt_render_product_module( $attributes): void {
// Fields data.
if ( empty( $attributes['data'] ) ) {
	return;
}
// Custom CSS class name.
$class = 'twt-product-module ' . ( $attributes['className'] ?? '' );
if ( ! empty( $attributes['align'] ) ) {
	$class .= " align{$attributes['align']}";
}
?>
<div class="<?= trim($class); ?>">
    Price in $:
	<?php
	echo $attributes['data']['price'];
	?>
</div>
<?php
}

add_action('rwmb_meta_boxes', 'twt_metabox_io_blocks');

When I enter $99 as the field value, I get the following output: Price in \$: \$99

When I downgrade MB Blocks to version 1.4.2 the backslashes don't show.

I will submit the login credentials through the contact form shortly.

Thank you!