Steps to Reproduce

Put any hflex or vflex to any element.

Current Result

1. Sometimes you get a white page until you resize the browser.
2. Elements do not get the process CSS for hflex or vflex like in previous versions.

Expected Result

Should work like all the times with versions 8.6.x

Debug Information

Workaround

We need to force the window to resize in order to make this work.

<script defer="true">
      zk.afterMount(function()

, 100);
</script>