Because the new bottom navigation sits just above the keypad's word suggestions on mobile, it's very easy to accidentally click away from a review page while trying to accept one of the word suggestions.

There should be an auto-save of in progress reviews, especially before moving to another page, since it's unlikely to be common for a user to want to discard a review they're currently working to write.

There should also be an optional check in with the user if they really want to navigate away from in progress work. Especially with reviews, but maybe with comments in challenges or something else that could be accidentally terminated by a misclick on a small screen. Enabled by default but something that can be opted out of from user settings if someone isn't keen.