JIRA v8.2.1
I've got a link to a ticket like https://my-server/browse/JIRA-001-xxx
In that case the ticket number is JIRA-001 and the -xxx part was a mistake in the link, but I didn't notice first
After I clicked to the link, it worked (showed the ticket, comments, ...)
Then I tried to add a comment and the response was Communication Breakdown popup
the real http response was 404 with the body: `{"errorMessages":["Issue Does Not Exist"],"errors":{}}`
the reason of this was because the request had the -xxx in the comment url: "https://my-server/rest/api/2/issue/JIRA-001-xxx/comment"