Expected behavior: When the conversation is closed, the "Submit" button under the text field for seed comments should be greyed out (or even the whole component disabled ?), whith some text explaining that comments can only be added in an open conversation.
Actual behavior: Currently, it is possible to write a seed comment and try to submit it, only to get an unformatted error that the conversation is closed, which is confusing for non-technical users.
To Reproduce: Create a new conversation, untick the "Conversation is open" box and try to add a seed comment.
Additional context: This is mostly a UX problem more than a bug, but it did confuse quite a few of my users initially :)