I had already opened a bug for this, but apparently this is Not a Bug because there is no easy way to fix it (if our developers would reason like that we would be out of business by now):
https://jira.atlassian.com/browse/GHS-7266
Our rapidboard filters are based on sprint teams and if e.g. Team Rocket cannot complete an issue, or removes it from the sprint, and another team takes over, this issue "magically" disappears from the reports for the completed sprint of Team Rocket. Is that acceptable?