OwnDataAccessCheck misses cacheability metadata

return AccessResult::allowedIf($routeMatch && $routeMatch->getRawParameter('user') == $account->id());

says that is depends on the current user account, but this information is not present.

Suggested fix:

  $access = AccessResult::allowedIf($routeMatch && $routeMatch->getRawParameter('user') == $account->id());
  $access->addCacheContexts(['user']);

  return $access;