As you can see in the screenshot, I typed this and it's being hidden by the keyboard. Version 2.49.1 on Android; Gboard version 18.2.4.969776716-release-arm64-v8a at time of testing.
I would describe it as a "serious" issue that affects usability. It means that for every line break that ends up "underneath" the keyboard, I need to scroll to see what I'm typing and then open the keyboard again.
I don't think the behaviour was like this before.
I'll note that the comment on replying to behaves properly -- it gets scrolled down correctly.