Not sure if this is an issue, or just a need for clarification.

When I was creating a video tutotial about longform posts, I started the post at the generic post creation button that show up in the Home feed. Things went strange when I tried to share it with the toolbox community. The community shows up in the list of places to share to, but did not accept the request to publish. So I cancelled that post and went into the community to create a new post, which was successfully posted.

So, what might be the issue with that dropdown list of destinations?

Does the list of shareable communities reflect whether a post can actually go to that community?

I'm posting this as a bug because it seems like that's one possible explanation.