The default FileSystemProvider maintains two files for each wiki page. e.g. MyPage.txt has an associated MyPage.properties, which records the timestanp and author of the last change to that page.
VersioningFileProvider contains logic to "migrate" a wiki page created by FileSystemProvider when it is next updated. This migration works properly for MyPage.txt, but the new change history for the page in the OLD/ subdirectory starts at version 2 and ignores the history available in MyPage.properties.
Also, the original MyPage.properties remains in "suspended animation", even though the migrated page history has been created.