It is possible to add new lines to descriptions. Click into description field and then press enter. Then enter more text. Save. This should not be possible.
Related issue: When pressing enter after editing a description a new line is added before saving in the user interface. The actually saved edit seems fine.
Description
Description
| Status | Subtype | Assigned | Task | |
|---|---|---|---|---|
| · · · | ||||
| Invalid | None | T75654 Redesign Wikidata header | ||
| Resolved | Snaterlicious | T87578 new lines in description | ||
| · · · |