ADLS Gen2 cross-account copy progress reaches 100% before the copy finishes

[craxal]

Bug Description

When copying an ADLS Gen2 folder (or any group of items) between two storage accounts, the activity shows 100% progress while it is still copying items. The transfer eventually does complete correctly, but the progress indicator finishes well ahead of the actual work.

Steps to Reproduce

1. Connect two ADLS Gen2 (hierarchical-namespace) storage accounts.
2. Select a folder containing a mix of files and subfolders in the source account.
3. Copy it to a container in the destination account.
4. Watch the Activities pane.

Actual Experience

Progress reaches 100% noticeably before the copy is actually finished. The activity continues to report newly transferred items after that point, and the "Transfer complete" message can arrive seconds to minutes later depending on the size and shape of the folder.

Expected Experience

Progress should not reach 100% until every item in the job has been transferred (or failed/skipped). It is fine for progress to advance smoothly during the byte transfer, but it should not hit 100% while items are still being processed.

Workaround

Treat the progress value as a rough indicator only and wait for the "Transfer ... complete" entry in the activity log before assuming the copy is finished.

[craxal]

Thanks for the detailed report. We've traced this to how AzCopy reports byte-based progress for server-side (cross-account) copies: bytes get fully accounted before all items finish, so the indicator hits 100% prematurely. There's already an analogous fix in the delete flow; we'll apply the same item-count–based progress calculation to the copy flow.