Catalogue thumbnails for migrated diagrams are blank
What you are seeing
Catalogue thumbnails for migrated diagrams have gone blank.
#Why it happens
Until Capable generates its own thumbnail, a migrated diagram points at the old vendor preview image on the original page. Deleting those preview files, or the pages holding them, breaks the thumbnail and some exports.
#What to do
Do not clean up old draw.io preview attachments immediately after migrating. Leave them in place until you have confirmed thumbnails have regenerated.
#Related
Thousands of draw.io macros failed on invalid diagram content
Thousands of draw.io macros failed with a message about invalid diagram content.
Migrated diagrams show old content
Migrated draw.io diagrams are showing old content instead of the current drawing.
Diagram problems after migrating
The rest of this family.
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