Confluence bridge for Drawio doesn't work for all diagrams

[oanalavinia]

Describe the bug
After migrating from Confluence, I have some drawio diagrams that don't work (cannot convert them in order to be able to edit). In my case, the diagrams that don't work are gliffy diagrams converted to drawio in Confluence using https://info.seibert.group/display/DRAWIO/Diagramming+in+Confluence+-+Mass+import+from+Gliffy+to+draw.io

To Reproduce

1. Have a page in confluence that has 2 diagrams, one gliffy and one drawio , e.g. page name GliffyConvertedToDrawioPage
2. Convert the gliffy diagram to drawio using https://info.seibert.group/display/DRAWIO/Diagramming+in+Confluence+-+Mass+import+from+Gliffy+to+draw.io
3. Export this space
4. Use the Confluence Migrator tool to migrate this space
5. Go to GliffyConvertedToDrawioPage and try to convert both diagrams to editable ones

Expected behavior
The convert button is displayed for both diagrams and so you can convert them.

Actual behavior
The convert button is not displayed for the diagram that was converted from gliffy

Screenshots

These are the attachments, and you can notice for the gliffy diagram that you don't have the same name for the diagram and the preview

Environment (please complete the following information):

• OS: Fedora
• Browser Firefox
• XWiki version 16.10.2
• App version 1.26.7