Description of problem:
cannot install qemu-ga to some guests even though the scheduled installation task exist

Version-Release number of selected component (if applicable):
virt-v2v-1.40.2-22.module+el8.2.0+6029+618ef2ec.x86_64
libguestfs-1.40.2-22.module+el8.2.0+6029+618ef2ec.x86_64
virtio-win-1.9.9-3.el8.noarch

How reproducible:
100%

Steps to Reproduce:
Set environment
1)For the conversion server: setup export VIRTIO_WIN=/usr/share/virtio-win/
2)Make sure the guest already installed powershell.

Scenario 1:convert a win2008r2-x86_64 guest to rhv:
1.1# virt-v2v -ic vpx://root@10.73.73.141/data/10.73.196.89/?no_verify=1 -o rhv-upload -os nfs_data -of raw esx6.5-win2008r2-x86_64 -on esx6.5-win2008r2-qemu-ga -it vddk -io vddk-libdir=/home/vmware-vix-disklib-distrib/ -io vddk-thumbprint=1F:97:34:5F:B6:C2:BA:66:46:CB:1A:71:76:7D:6B:50:1E:03:00:EA -oc https://ibm-x3250m5-03.rhts.eng.pek2.redhat.com/ovirt-engine/api -op /tmp/rhvpasswd -oo rhv-cafile=/home/ca.pem -oo rhv-cluster=Default -oo rhv-verifypeer=true -oo rhv-direct -ip /tmp/passwd
[ 0.8] Opening the source -i libvirt -ic vpx://root@10.73.73.141/data/10.73.196.89/?no_verify=1 esx6.5-win2008r2-x86_64 -it vddk -io vddk-libdir=/home/vmware-vix-disklib-distrib/ -io vddk-thumbprint=1F:97:34:5F:B6:C2:BA:66:46:CB:1A:71:76:7D:6B:50:1E:03:00:EA
[ 2.7] Creating an overlay to protect the source from being modified
[ 6.1] Opening the overlay
[ 12.4] Inspecting the overlay
[ 23.0] Checking for sufficient free disk space in the guest
[ 23.0] Estimating space required on target for each disk
[ 23.0] Converting Windows Server 2008 R2 Standard to run on KVM
virt-v2v: warning: /usr/share/virt-tools/pnp_wait.exe is missing.
Firstboot scripts may conflict with PnP.
virt-v2v: This guest has virtio drivers installed.
[ 25.2] Mapping filesystem data to avoid copying unused and blank areas
[ 26.2] Closing the overlay
[ 26.2] Assigning disks to buses
[ 26.2] Checking if the guest needs BIOS or UEFI to boot
[ 26.2] Initializing the target -o rhv-upload -oc https://ibm-x3250m5-03.rhts.eng.pek2.redhat.com/ovirt-engine/api -op /tmp/rhvpasswd -os nfs_data
[ 27.4] Copying disk 1/1 to qemu URI json:

(raw)
(100.00/100%)
[ 827.1] Creating output metadata
[ 828.5] Finishing off

1.2 Conversion can be finished successfully,and boot guest on rhv

1.3 Check if the guest has installed qume-guest-agent and the service is running normally.
a.Can find qemu-ga-x86_64 windows installer package in C:/
b.Can not find qemu-ga log file named qemu-ga-x86_64.msi in C:/.
c.Can not find qemu-ga service in guest.
d.There is 0002-installation-qemu-ga.msi in c:/Program Files/Guestfs/Firstboot/scripts-done

1.4 After removing the 'echo off' commands from batch files,and run command in cmd,find installation task already exist.
Details pls refer to attachment named 'win2008r2-qemu-ga installation task'.

Actual results:
cannot install qemu-ga to win2008r2 guest even though the task already exist.

Expected results:
can install qemu-ga to win2008r2 guest when the installation task exist

Additional info:
1.Can reproduce the bug for win7-86_64 and win2008-x86_64 guests.