just something I noticed yesterday...you may have this logged but when you set page thumbnail to small and set new document
..sometimes the label can wrap in the space..to 2 lines you can end you with 3 dots
As attached
1. import document (created in .162) for testing place PDF
2. Select page (any page)
3. Toggle Preview button
4. Sections of the bleed area get left behind as artefacts
as attached: