5.9 beta - Problems with wp_json_encode or <script> tags within JSX blocks

Problem
I'm trying to use wp_json_encode to pass data in a data-attribute to a JSX-enabled ACF block. It works on the frontend, but in the ACF preview in the block editor, the data is not encoded properly. It shows up as : [object Object] (see screenshot). Removing the __experimental_jsx support flag fixes the issue.

As a workaround, I also tried to include the data in a <script> tag within the block, also using wp_json_encode. In this case the data appears to be encoded correctly (see screenshot), but the script does not execute. Removing the __experimental_jsx support flag fixes the issue, and the script executes.

Code

<?php
acf_register_block_type(array(
    'name'              => 'hero',
    'title'             => __('Hero'),
    'description'       => __('Display a random hero image.'),
    'supports'          => array('__experimental_jsx' => true),

    'render_callback'   => function($block) {
      $className = $block['className'] ?: '';
      $images = get_field('images');
      if (!empty($images)):
        ?>
          <section class="wp-block-hero alignfull" data-random="<?= esc_attr(wp_json_encode($images)) ?>">
            <script type="text/javascript">
              window.heroData = window.heroData || {};
              window.heroData['<?= $block['id'] ?>'] = <?= wp_json_encode($images) ?>;
              console.log(window.heroData);
            </script>
            <div class="container">
              <InnerBlocks />
            </div>
          </section>
        <?php
      endif;
    }
  ));

Reproduce the issue in the ACF block editor preview using the supplied render_callback, focusing on wp_json_encode output in the data attribute and script tag with __experimental_jsx enabled. Compare the behavior with that support flag removed. Done means the encoded data remains usable in the preview and the script executes while JSX support is enabled.