Columns block missing classes

[zkingdesign]

Describe the bug
I'm having issues when adding in new column blocks. While before the html looked like this :
<div class="wp-block-columns has-3-columns">

now the front-end is only outputting:
<div class="wp-block-columns">

Why is this happening?

Additional context

• Gutenberg 6.6

[youknowriad]

Hi there and thanks for opening the issue.

This is an intended change though. The idea is that right now the columns can have different widths so relying on the number of columns (that className) to style them might not be a great idea.

We wrote this post that goes through all the theme related changes for WordPress 5.3 https://make.wordpress.org/core/2019/09/27/block-editor-theme-related-updates-in-wordpress-5-3/

Thanks.