Specifications

Source: Windows Server 2003
SQL Server Version: 2005

Destination: Windows Server 2008r2
SQL Server Version: 2008

Command: Copy-SqlDatabase -Source SourceName -Destination DestinationName -Verbose -BackupRestore -ReuseFolderstructure -NetworkShare \\fileshare\sql\migration -All -Force

Expected behavior

Database migration should complete

Actual Behavior

Shows whole bunch of errors. Like:

(1) Join-AdminUnc : Cannot process argument transformation on parameter 'filepath'. Cannot convert value to type System.String.
At C:\dbatools\Function\Copy-SqlDatabase.ps1:650 char:45...

(2) WARNING: Restore failed: Restore failed for Server 'Destination'.

(3) Copy-SqlDatabase : Failed to update DatabaseOwnershipChaining for False on something on Destination
At C:\dbatools\Functions\Copy-SqlDatabase.ps1:1039 char:3...

(4) Copy-SqlDatabase : Failed to update Trustworthy to False for something on Destination
At C:\dbatools\Functions\Copy-SqlDatabase.ps1:1039 char:3...

Workaround

Not using -ReuseFolderstructure seems to migrate database properly.