With an upload-id-marker the lister ranges over Uploads[startIndex:],
but passed the index of that subslice to hasMoreAfter, which indexes
the full list. A page that ended on the last remaining upload was still
reported as truncated, with next markers pointing at that upload, so a
client had to make one more request to get an empty page.
Iterate over the full list from startIndex, so hasMoreAfter gets the
real position of the next upload.
dualfroz
2f2ed7ae25