When using column-count, overflowing content completely disappears in all but first column, why?

I honestly have no idea why this happens, I am looking the docs if they have specified this behavior, I want to check whether its intentional or it's a bug. For now I am using

-webkit-transform: translateX(0);
-moz-transform: translateX(0);
transform: translateX(0);

And it works... So add the above properties in #main_wrap > div and I think if you are ruling out the vendor prefixes than transform: translateX(0); is sufficient.

Demo

Ok, I think it's a bug :

Issue 84030 : CSS 3 Column bug (overflow: hidden like functionality where it shouldn't)

The absolute positioned elements are clipped as if there is an overflow: hidden applied to the box. However, applying overflow: visible or any other rule does not fix the problem

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I thought more over this, as I suggested the first solution which I randomly inserted the properties and it worked, there is also a way where you can legally do what you are doing by using a clip property and you won't need overflow: hidden; anymore..

#main_wrap > div > div{
    position:absolute;
    background:red;
    border-radius:40px;
    width:40px;
    height:40px;
    right:-20px;
    top:0;
    clip: rect(0px,20px,40px,0px);
}

Demo 2 (Clip Demo)

I spent quite a bit of time investigating this problem and found the suggestion to add the CSS property will-change: transform; to the items inside the column layout. For example:

<div class="container">
  <div class="item">
    <!-- Things with overflowing content -->
  </div>
  <div class="item">
    <!-- Things with overflowing content -->
  </div>
  <div class="item">
    <!-- Things with overflowing content -->
  </div>
</div>

<style>
  .container {
    columns: auto 5;
    column-gap: 0;
    margin: -16px;
  }

  .items {
    break-inside: avoid;
    padding: 16px;
    page-break-inside: avoid;
    will-change: transform;
  }
</style>