Save button does not work in Big Editor Mode.

What's up?

The save button in Big Editor Mode does not work for wikis. I have confirmed it to work for regular posts and comments. I am forced to use the close button and then save the page using the normal save button.

Where does it happen?

So far it has happened on both subs I moderate. Presumably it occurs on any sub.

Screenshots or mock-ups

https://gfycat.com/UnsteadyFinishedElver

What browser extensions are installed?

uBlock Origin

• Night mode: false
• RES Version: 5.8.0
• Browser: Chrome
• Browser Version: 59
• Cookies Enabled: true
• Reddit beta: false