fixed-grid has-auto-count not working?

Overview of the problem

I don't know if I'm missing something but I can't get fixed-grid has-auto-count working. I am using bulma 0.9.3 I tried in Firefox and in Edge

Description

I copy/pasted the example for "fixed-grid has-auto-count" from https://bulma.io/documentation/grid/fixed-grid/ and tried it but all cells are showing on their own line. To make sure bulma is up and running, I used some bulma classes inside cells and it's working.

Steps to Reproduce

Try with this piece of html copy/pasted from https://bulma.io/documentation/grid/fixed-grid/ where I just added the link to Bulma cdn and a button for the first cell to show bulma is loaded :

<html>
  <head>
    <link rel="stylesheet"
          href="https://cdn.jsdelivr.net/npm/bulma@0.9.3/css/bulma.min.css">
  </head>
  <body>
    <div class="fixed-grid has-auto-count">
      <div class="grid">
        <div class="cell"><button class="button is-primary">Cell1</button></div>
        <div class="cell">Cell 2</div>
        <div class="cell">Cell 3</div>
        <div class="cell">Cell 4</div>
        <div class="cell">Cell 5</div>
        <div class="cell">Cell 6</div>
        <div class="cell">Cell 7</div>
        <div class="cell">Cell 8</div>
        <div class="cell">Cell 9</div>
        <div class="cell">Cell 10</div>
        <div class="cell">Cell 11</div>
        <div class="cell">Cell 12</div>
        <div class="cell">Cell 13</div>
        <div class="cell">Cell 14</div>
        <div class="cell">Cell 15</div>
        <div class="cell">Cell 16</div>
      </div>
    </div>
  </body>
</html>

Expected behavior

Cells should show on several columns, the number of which depending on the size of the screen

Actual behavior

Only one column whatever the size of the screen:

jgthms / bulma