Publisher manual usage does not upload the task

Using publisher with manually giving a task to upload does not upload the task to remote.
e.g. 

./bin/publisher --remote --publish-task /mnt/coin-storage-01/ci-working-dir/storage/qt/qtbase/tasks/1598921428.thrift_bin

Output indicates that everything goes right but nothing is uploaded https://paste.qt.io/pcd2ln6u5/qcmasa. This is due to the fact that the uploads are scheduled and processed after 5 seconds and the program killed before the scheduled uploads are processed.