Default rule causes all blocks to lose assignment

I have a custom module that only declares a default rule through hook_default_rules_configuration. For some reason at some point, that I haven't determined yet, all of the blocks are unassigned. I have narrowed it down to this function, if I comment it out it the blocks never do this, but if I let the function run it happens after a few hours of letting the site sit and coming back to it.

Here is my module.rules_defaults.inc file:

<?php
function module_default_rules_configuration() {
  $config = array();
  $rules_path = drupal_get_path('module', 'module') . '/rules';
  $files = file_scan_directory($rules_path, '/\.rule$/');
  foreach ($files as $filepath => $file) {
    require $filepath;
    if (isset($rule)) {
      $config['module_' . $file->name] = rules_import($rule);
    }
  }
  return $config;
}

And here is my rule_name.rule located in module/rules:

<?php
/**
* Rule exported to code: email_default.
*/
$rule =
  '{ "email_default" : {
    "LABEL" : "Module OG Invite Email",
    "PLUGIN" : "rule",
    "REQUIRES" : [ "php", "mimemail" ],
    "USES VARIABLES" : {
      "user_module_og_invite" : { "label" : "User email sends to", "type" : "user" },
      "user_password_module_og_invite" : { "label" : "User password", "type" : "text" },
      "group_organization_entity" : { "label" : "Group organization", "type" : "node" },
      "group_inviting_user" : { "label" : "Group inviting user", "type" : "text" }
    },
    "DO" : [
      { "mimemail" : {
          "to" : "\u003C?php echo $user_module_og_invite-\u003Email; ?\u003E",
          "subject" : "You\u0027ve been invited to Site",
          "body" : "\u003C?php global $base_url; ?\u003E\r\n\u003Ch1 style=\u0022color: #F16653; font-size: 28px; line-height: 30px; font-weight: normal; margin-top: 0px; margin-bottom: 25px;\u0022\u003EYou\u2019ve been invited to \u003Ca href=\u0022mailto:\u003C?php echo $group_inviting_user; ?\u003E\u0022 style=\u0022color: #F16653!important; text-decoration: none!important;\u0022\u003E\u003C?php echo $group_inviting_user; ?\u003E\u003C\/a\u003E\u2019s Site account for \u003C?php echo $group_organization_entity-\u003Etitle; ?\u003E.\u003C\/h1\u003E\r\n\u003Cp\u003EPlease use the login information below to get started. We recommend that after logging in for the first time you change your password.\u003C\/p\u003E\r\n\u003Cp\u003E\r\nLogin: \u003C?php echo $user_module_og_invite-\u003Email; ?\u003E\r\n\u003Cbr\/\u003E\r\nPassword: \u003C?php echo $user_password_module_og_invite; ?\u003E (we recommend changing upon login)\r\n\u003C\/p\u003E\r\n\u003Ctable\u003E\r\n\u003Ctr\u003E\r\n\u003Ctd align=\u0022center\u0022 valign=\u0022middle\u0022 style=\u0022padding-top: 30px;\u0022\u003E\r\n\u003Ca href=\u0022\u003C?php echo $base_url; ?\u003E\/user\/login\u0022 target=\u0022_blank\u0022 style=\u0022font-size: 22px; color: #F16653; text-decoration: none;\u0022\u003E\u003Cimg src=\u0022\u003C?php echo $base_url; ?\u003E\/sites\/all\/themes\/omega\/theme\/images\/email\/email-click-to-login.gif\u0022 alt=\u0022Click Here to Login\u0022 \/\u003E\u003C\/a\u003E\r\n\u003C\/td\u003E\r\n\u003C\/tr\u003E\r\n\u003C\/table\u003E"
        }
      }
    ]
  }
}';
?>