Hi There!   I'm trying to use the new timeline to add a new historical event to my world, It was working fine this morning until about half an hour ago. When I click on the add button in the middle it makes my screen go black, I've changed to light theme and it made the screen go white. So it looks like the only way I can add events is through historical events in standard timeline right now.   Appreciate any help, Thank you.

Steps to Reproduce

Edit Timeline, Click on Create A Historical Event, Blank Screen.

Operating System

Browser

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