I was doing a world export (after organizing all my historical entries) and only the unfiled one showed up in the export. Once I moved some out of folders to the root, they appeared in the export.As a workaround for me, personally, I just added tags, moved to root and export is 100%.
File one or more Historical Entries (Other object?) ton a folder and perform a world export. Download and go to the folder in the export and the entry will be missing.
Hey kaixabu, the community member Soullink who created the World exporter has included support for entities within folders - so I will be closing this bug report, thank you for reporting!