Jumble treats that as a reply, so you’ll only see it under the Replies tab.

As far as I know, most nostr clients either don’t support Amethyst’s communities at all or only partially, because the protocol itself has a lot of flaws. I want to stress again that Jumble doesn’t support communities — if you really need that feature, you’ll have to stick with Amethyst. And you should also be aware that posts made in communities usually won’t be visible to people who aren’t using Amethyst. Personally, I think Amethyst should warn users about this, just like Jumble shows a warning when you create a poll that may not display properly on other clients.