Why is canvas not rendering when enabling child object?

Hi, as you can see in the video below, for some reason canvas is not rendering when the child object is enabled, unless the canvas is disabled/enabled again.

 

It looks like a bug to me. Could you please submit a bug-report as described in this document:
https://unity3d.com/unity/qa/bug-reporting

It's important that you report these issues together with a reproduction project if you want them to get fixed. If you don't do it, it might be a long time until someone else reports them or until Unity Technologies find them.

After you submitted the bug-report, you receive a confirmation email with a bug-report Case number. Please post the Case number (number only, not the link) in this forum thread for Unity staff to pick up.

 

Project is above 5.2gb - is it still ok to try to upload it?

It also requires username/password to login and play a bit before the bug happens.. its kinda messy to replicate it