Missing CSS Rule in grid.plone.less - Grid is broken by custom Build

[1letter]

The following Situation:
I build my custom CSS and use some barceloneta less files, especially the Grid Definitions.

My CSS Less File:

// Core variables and mixins
@import "++theme++barceloneta/less/variables.plone.less";
@import "++theme++barceloneta/less/mixin.clearfix.plone.less";
@import "++theme++barceloneta/less/mixin.gridframework.plone.less"; //grid Bootstrap
@import "++theme++barceloneta/less/mixin.grid.plone.less"; //grid Bootstrap
@import "++theme++barceloneta/less/normalize.plone.less"; // Reset and dependencies
@import "++theme++barceloneta/less/grid.plone.less"; //grid Bootstrap

... here my own defs
h1{color:red;}

The normal Bootstrap Grid, for Example this:

<div class="row">
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
</div>
<div class="row">
  <div class="col-md-8">.col-md-8</div>
  <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
  <div class="col-md-4">.col-md-4</div>
  <div class="col-md-4">.col-md-4</div>
  <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
  <div class="col-md-6">.col-md-6</div>
  <div class="col-md-6">.col-md-6</div>
</div>

is broken, because the Definition:

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

is missing.
Please add this to grid.plone.less or normalize.plone.less