Assuming a new version of React is bundled with WordPress 5.4, which broke Restplain. Testing this on a site in 5.3 and 5.4 to verify. Console errors: <img width="1734" alt="Screen Shot 2020-04-04 at 6 09 04 PM" src="https://user-images.githubusercontent.com/367897/78464520-6d121280-769f-11ea-9627-f33a4adbdfb0.png">
Assuming a new version of React is bundled with WordPress 5.4, which broke Restplain. Testing this on a site in 5.3 and 5.4 to verify.
Console errors:
