CRUD: [Bug] Class "Backpack\CRUD\ViewNamespaces" not found in 5.3.6

After doing a composer update to 5.3.6 I get this

Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

   Error 

  Class "Backpack\CRUD\ViewNamespaces" not found

  at vendor/backpack/pro/src/AddonServiceProvider.php:19
     15▕ 
     16▕     public function boot(): void
     17▕     {
     18▕         $this->autoBoot();
  ➜  19▕         ViewNamespaces::addFor('buttons', $this->vendorName.'.'.$this->packageName.'::buttons');
     20▕         ViewNamespaces::addFor('columns', $this->vendorName.'.'.$this->packageName.'::columns');
     21▕         ViewNamespaces::addFor('fields', $this->vendorName.'.'.$this->packageName.'::fields');
     22▕         ViewNamespaces::addFor('filters', $this->vendorName.'.'.$this->packageName.'::filters');
     23▕         ViewNamespaces::addFor('widgets', $this->vendorName.'.'.$this->packageName.'::widgets');      

      +7 vendor frames 
  8   [internal]:0
      Illuminate\Foundation\Application::Illuminate\Foundation\{closure}(Object(Backpack\Pro\AddonServiceProvider))

      +5 vendor frames 
  14  artisan:37
      Illuminate\Foundation\Console\Kernel::handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1