React warning when using custom column renderer on React demo

"I'm seeing "flushSync was called from inside a lifecycle method" warnings whenever I use a custom column "renderer".

I see it in the basic react example when I run it locally."

Go to any React demo, and add a custom column renderer (as example)

{
            field : 'team',
            text :
                'Team<div class="small-text">(inline JSX)</div>',
            htmlEncodeHeaderText : false,
            flex                 : 1,
            // Using simple inline JSX
            renderer             : ({ value }) => <b>{StringHelper.encodeHtml(value)}</b>
        }

When running locally, the warning will appear

bryntum / support

React warning when using custom column renderer on React demo #10158