Issue while running sfpowerkit plugin in jenkins run time - groovy

Question

after installing SFpower kit in run time, the plugin is able to compare two commit i'ds and generate delta package. But sometimes the Package.xml from the folder is getting copied to this delta package and sometimes package.xml is not getting copied and the end the Jenkins Job is getting failed.
script i'm using :
sh 'npm install sfdx-cli --global --force'
sh 'sfdx --version'
sh 'sfdx update'
sh 'echo y | sfdx plugins:install sfpowerkit'
sh 'sfdx sfpowerkit:project:diff --revisionfrom sourcecommiti'd --revisionto targetcommiti'd --output Delta_pkg/ --loglevel DEBUG'
In the below image the Package.xml got copied from git to delta package and the validation went successfulenter image description here
in the below logs the jenkins job is not able to copy the Package.xmlenter image description here
and the out put for the above build was as shown belowenter image description here
Sometimes when the package.xml is copied to delta_pkg the error is as shown in above image.
sfdx sfpowerkit:project:diff --revisionfrom bdad36ff4c7095686876518e9eb49184646442ae --revisionto 3c55f518f075fe4e266f71589d11c6b79f3343b4 --output Delta_pkg/ --loglevel DEBUG
Config folder does not exists, Creating Folder
sfpowerkit -- The DX#Scale Developer Toolkit - Version:6.0.1 - Release:November 22
Input Param: From: bdad36ff4c7095686876518e9eb49184646442ae To: 3c55f518f075fe4e266f71589d11c6b79f3343b4
SHA Found From: bdad36ff4c7095686876518e9eb49184646442ae
To: 3c55f518f075fe4e266f71589d11c6b79f3343b4
Fetching file list from target revision 3c55f518f075fe4e266f71589d11c6b79f3343b4
Copying file force-app\main\default\classes\PE_ApprovedEmailControllerTest.cls from git to Delta_pkg/
Copying file force-app\main\default\classes\PE_ResponseWrapper.cls from git to Delta_pkg/
Copying file force-app\main\default\lwc\adm_caseUnlocker\adm_caseUnlocker.html from git to Delta_pkg/
Copying file force-app\main\default\lwc\adm_cloneUser\adm_cloneUser.js from git to Delta_pkg/
Copying file force-app\main\default\lwc\csc_SearchInvoiceLine\csc_SearchInvoiceLine.html from git to Delta_pkg/
Copying file force-app\main\default\package.xml from git to Delta_pkg/
Generating output summary
Copying file .forceignore from git to Delta_pkg/
Copying file sfdx-project.json from git to Delta_pkg/
Output
BUILD FAILED
C:\Program Files (x86)\Jenkins\workspace\pocv1_PR-57\build.xml:66:
*********** DEPLOYMENT FAILED ***********
Request ID: 0Af6s00000knqgECAQ
All Component Failures:
package.xml -- Error: No package.xml found
package.xml -- Error: Bad file:XML document structures must start and end within the same entity.
*********** DEPLOYMENT FAILED ***********
Need some solution here.
Thanks in advance
I'm expecting the sfpower kit which i'm using in my jenkins should be able to pick the changes between 2 commit i'ds and output folder should also have package.xml and this output folder should be triggered for validation without any errors related to CICD.