Facet checkbox doesn't work with bigpipe

+1 on this issue, although for me it only happens in combination with bigpipe enabled, and an authenticated user. Anonymous users work fine with bigpipe enabled.

We were seeing something similar, too, where Facet blocks were not showing up sometimes with BigPipe enabled. It was not a problem on every page load, though. Seems like it might be due to a race condition?

Just FYI, you can disable BigPipe for Facet blocks by adding this to a custom module:

use Drupal\Core\Block\BlockPluginInterface;

/**
 * Implements hook_block_build_BASE_BLOCK_ID_alter().
 */
function example_block_build_facet_block_alter(array &$build, BlockPluginInterface $block) {
  // Disable BigPipe placeholder for this block.
  $build['#create_placeholder'] = FALSE;
}