Apologies if this has been reported - I’m on my mobile and it’s a bit hard to do a thorough searching and typing.
If you enter incorrect (I left it empty) email and click subscribe button, the field gets invalidated. The problem is that it stays this way even after you correct it.
It happened to me here https://brave.com/search/ on brave Browser, on Samsung note 20 5g ultra. I’ll gladly provide more details if required.