Can't Place Custom Block in BrowserTestBase

I'm trying to set up a test for my custom module. But I can't seem to place my custom block. I can place system blocks just fine. So I don't know if there's something special with a block I make in my custom module.

If I try a system block, it's fine...
$this->drupalPlaceBlock('system_powered_by_block');

If i try my block, not so much...
$this->drupalPlaceBlock('search_block');

My test code:

<?php

namespace Drupal\Tests\dealers\Functional;

use Drupal\Tests\BrowserTestBase;

class UiPageTest extends BrowserTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = ['dealers', 'geocoder', 'field', 'filter', 'block', 'text', 'node'];

  /**
   * Theme to enable.
   *
   * @var string
   */
  protected $defaultTheme = 'stark';

  /**
   * {@inheritdoc}
   */
  protected function setUp(): void {
    parent::setUp();

    // Create an article content type that we will use for testing.
    $type = $this->container->get('entity_type.manager')->getStorage('node_type')
      ->create([
        'type' => 'article',
        'name' => 'Article',
      ]);
    $type->save();
    $this->container->get('router.builder')->rebuild();

    $this->drupalPlaceBlock('search_block');
  }

  /**
   * Tests that the reaction rule listing page works.
   */
  public function testDealerConfigurationPage() {
    $account = $this->drupalCreateUser(['administer site configuration']);
    $this->drupalLogin($account);

    $this->drupalGet('admin/config/dealers');
    $this->assertSession()->statusCodeEquals(200);
  }

  /**
   * Tests that the reaction rule listing page works.
   */
  public function testDealerSearchPage() {
    $this->drupalGet('');

    // Test that there is an empty reaction rule listing.
    $this->assertSession()->pageTextContains('Dealer search block');
  }
}

My block plugin:

namespace Drupal\dealers\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Form\FormBuilder;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;
use Drupal\Core\Messenger\MessengerInterface;
use Symfony\Component\HttpFoundation\RequestStack;
use Drupal\Core\Config\ConfigFactory;
use Drupal\Core\Database\Connection;
use Drupal\geocoder\Geocoder;

/**
 * Provides a 'SearchBlock' block.
 *
 * @Block(
 *  id = "search_block",
 *  admin_label = @Translation("Dealer search block"),
 *  category = @Translation("Dealers")
 * )
 */
class SearchBlock extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * Form builder.
   *
   * @var \Drupal\Core\Form\FormBuilder
   */
  protected FormBuilder $formBuilder;

  /**
   * The database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected Connection $database;

  /**
   * Drupal\Core\Logger\LoggerChannelFactoryInterface definition.
   *
   * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
   */
  protected LoggerChannelFactoryInterface $loggerFactory;

  /**
   * Drupal\Core\Messenger\MessengerInterface definition.
   *
   * @var \Drupal\Core\Messenger\MessengerInterface
   */
  protected $messenger;

  /**
   * Symfony\Component\HttpFoundation\RequestStack definition.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected RequestStack $requestStack;

  /**
   * Configuration Factory.
   *
   * @var \Drupal\Core\Config\ConfigFactory
   */
  protected ConfigFactory $configFactory;

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected EntityTypeManagerInterface $entityTypeManager;

  /**
   * Geocoder.
   *
   * @var \Drupal\geocoder\Geocoder
   */
  protected Geocoder $geocoder;

  /**
   * Class constructor.
   */
  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    ConfigFactory $configFactory,
    FormBuilder $formBuilder,
    LoggerChannelFactoryInterface $logger_factory,
    MessengerInterface $messenger,
    RequestStack $request_stack,
    Connection $database,
    EntityTypeManagerInterface $entityTypeManager,
    Geocoder $geocoder
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->configFactory = $configFactory;
    $this->formBuilder = $formBuilder;
    $this->loggerFactory = $logger_factory;
    $this->messenger = $messenger;
    $this->requestStack = $request_stack;
    $this->database = $database;
    $this->entityTypeManager = $entityTypeManager;
    $this->geocoder = $geocoder;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('config.factory'),
      $container->get('form_builder'),
      $container->get('logger.factory'),
      $container->get('messenger'),
      $container->get('request_stack'),
      $container->get('database'),
      $container->get('entity_type.manager'),
      $container->get('geocoder')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [] + parent::defaultConfiguration();
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    $build = [];
    $build['#theme'] = 'dealers_search_block';
    $results = [];
    $resultCount = '0';
    $query = '';
    $message = '';

    $form = $this->formBuilder->getForm('Drupal\dealers\Form\DealerSearchForm');

    $q['zip'] = $this->requestStack->getCurrentRequest()->query->get('zip');
    $q['lat'] = $this->requestStack->getCurrentRequest()->query->get('lat');
    $q['lon'] = $this->requestStack->getCurrentRequest()->query->get('lon');

    if ($q['zip'] || ($q['lat'] && $q['lon'])) {
      $results = $this->getDealerResults($q);

      if (!empty($results)) {
        $resultCount = count($results);
      }

      if (!$results) {
        if ($q['zip'] != '') {
          $message = 'No dealers found for ' . $q['zip'] . '. Please try again.';
        }
        elseif ($q['lat'] && $q['lon']) {
          $message = 'No dealers found for ' . $q['lat'] . '/' . $q['lon'] . '. Please try again.';
        }
        else {
          $message = 'No dealers found. Please try again.';
        }
      }
    }
    else {
      $message = '';
    }

    if ($q['zip']) {
      $query = $q['zip'];
    }

    if ($q['lat'] && $q['lon']) {
      $query = 'your current location';
    }

    $build['#content']['resultCount'] = $resultCount;
    $build['#content']['query'] = $query;
    $build['#content']['form'] = $form;
    $build['#content']['results'] = $results;
    $build['#content']['message'] = $message;

    return $build;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() {
    return 0;
  }
}