Steps to reproduce:
Signup for a newsletter such as http://indielondon.co/ .
Enter email address
You'll get an error.
Do the same thing using Firefox and it'll work.
My email address to submit
Orion, OS version; hardware type:
Version 0.99.115.3-beta (WebKit 614.1.12)
MacBook Air (M1, 2020)
<Copy/paste or drag and drop to upload images or videos (up to 20MB)>
THIS NEXT SCREENSHOT IS IT WORKING ON FIREFOX: