Site collection restore on new URL failed

I try to move site collection to new URL using PowerShell commands Backup-SPSite and Restore-SPSite, but restore failed with "Restore-SPSite : Cannot rename old site / on restore". As a alternative to backup/restore I try to use Copy-SPSite to new URL, but I got simillar error "Copy-SPSite : Cannot rename old site / on copy". I made some investigations and from SQL Server trace I can see ,that stored procedure proc_RenameSite returned value 206 and according to this exception was thrown in SharePoint object model.