"update-icinga" of component "service" fails but reports "success"

The IfW-component has to be updated from version 1.2.0 to 1.3.0.:

Component    Version   Available
---          ---       ---
agent        2.15.2    2.15.2
framework    1.13.5    1.13.5
plugins      1.13.1    1.13.1
service      1.2.0     1.3.0

Try to update in an admin-PS with

update-icinga -confirm

[Notice]: The installed version "1.13.5" of component "framework" is identical or lower than the new version "1.13.5". Use "-Force" to install anyway
[Notice]: The installed version "1.13.1" of component "plugins" is identical or lower than the new version "1.13.1". Use "-Force" to install anyway
[Notice]: The installed version "2.15.2" of component "agent" is identical or lower than the new version "2.15.2". Use "-Force" to install anyway
[Notice]: Downloading "service" from https://mydownloadhost/service/icinga-service-v1.3.0.zip
[Notice]: Installing component "service" into "C:\Program Files\icinga-framework-service\"
[Notice]: Updating Icinga PowerShell Service binary
[Notice]: Waiting for lock on path "C:\Program Files\icinga-framework-service\icinga-service.exe" to be released before trying to remove it
[Error]: Failed to remove items from path "C:\Program Files\icinga-framework-service\icinga-service.exe". Recurse is "False", Force is "True": "System.UnauthorizedAccessException: Access to the path 'C:\Program Files\icinga-framework-service\icinga-service.exe' is denied.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileInfo.Delete()
   at Microsoft.PowerShell.Commands.FileSystemProvider.RemoveFileSystemItem(FileSystemInfo fileSystemInfo, Boolean force
)"
[Error]: Failed to copy items from path "C:\Program Files\icinga-framework-service\icinga-service.exe.update" to "C:\Program Files\icinga-framework-service\icinga-service.exe": System.IO.IOException: The process cannot access the file 'C:\Program Files\icinga-framework-service\icinga-service.exe' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)
   at System.IO.FileInfo.CopyTo(String destFileName, Boolean overwrite)
   at Microsoft.PowerShell.Commands.FileSystemProvider.CopyFileInfoItem(FileInfo file, String destinationPath, Boolean f
orce, PowerShell ps)
   at Microsoft.PowerShell.Commands.FileSystemProvider.CopyItemLocalOrToSession(String path, String destinationPath, Boo
lean recurse, Boolean Force, PowerShell ps)
   at Microsoft.PowerShell.Commands.FileSystemProvider.CopyItem(String path, String destinationPath, Boolean recurse)
   at System.Management.Automation.SessionStateInternal.CopyItem(CmdletProvider providerInstance, String path, String co
pyPath, Boolean recurse, CmdletProviderContext context)
[Notice]: Service User ".\LocalSystem" for service "icingapowershell" successfully updated
[Notice]: Stopping service "icingapowershell"
[Notice]: Starting service "icingapowershell"
[Notice]: Stopping service "icingapowershell"
[Notice]: Service User "NT AUTHORITY\NetworkService" for service "icingapowershell" successfully updated
[Notice]: Successfully set the icinga2 service to delayed autostart
[Notice]: Successfully set the icingapowershell service to delayed autostart
[Notice]: Installation of component "service" was successful

now check the "success":

show-icinga
[...]
Installed components on this system:

Component    Version   Available
---          ---       ---
agent        2.15.2    2.15.2
framework    1.13.5    1.13.5
plugins      1.13.1    1.13.1
service      1.2.0     1.3.0

so once again:

update-icinga -confirm
[Notice]: The installed version "1.13.5" of component "framework" is identical or lower than the new version "1.13.5". Use "-Force" to install anyway
[Notice]: The installed version "1.13.1" of component "plugins" is identical or lower than the new version "1.13.1". Use "-Force" to install anyway
[Notice]: The installed version "2.15.2" of component "agent" is identical or lower than the new version "2.15.2". Use "-Force" to install anyway
[Notice]: Downloading "service" from https://mydownloadhost/service/icinga-service-v1.3.0.zip
[Notice]: Installing component "service" into "C:\Program Files\icinga-framework-service\"
[Notice]: Updating Icinga PowerShell Service binary
[Notice]: Service User ".\LocalSystem" for service "icingapowershell" successfully updated
[Notice]: Stopping service "icingapowershell"
[Notice]: Starting service "icingapowershell"
[Notice]: Stopping service "icingapowershell"
[Notice]: Service User "NT AUTHORITY\NetworkService" for service "icingapowershell" successfully updated
[Notice]: Successfully set the icinga2 service to delayed autostart
[Notice]: Successfully set the icingapowershell service to delayed autostart
[Notice]: Installation of component "service" was successful

this was finally successful:

ls 'C:\Program Files\icinga-framework-service\icinga-service.exe' | % versioninfo

ProductVersion   FileVersion      FileName
--------------   -----------      --------
1.3.0.0          1.3.0.0          C:\Program Files\icinga-framework-service\icinga-service.exe

show-icinga
[...]
Component    Version   Available
---          ---       ---
agent        2.15.2    2.15.2
framework    1.13.5    1.13.5
plugins      1.13.1    1.13.1
service      1.3.0     1.3.0

Start by reproducing the behavior with the update-icinga -confirm and show-icinga entry points, focusing on the failed replacement of icinga-service.exe. Trace how the update command handles the reported deletion and copy errors. Done means a failed service update is reported as failed and the installed and available versions are consistent.