How to sort array with values property in jenkins groovy

Not able to sort the following array tried solutions are listed. Initial we will have list, by finding the position in another list new list is created

def mylist=[]
def mylistData=[:]
mylistData.id="61628d82a174599d7ae7c61bf6d216f22d5139da"
mylist.add(mylistData)
                    
mylistData=[:]
mylistData.id="0cc18d6d3c93240ab93457063b4974a1270104c0"
mylist.add(mylistData)

mylistData=[:]
mylistData.id="bb007a1c9f594b55662a5b36d5f5b1a7651f3b0f"
mylist.add(mylistData)

mylistData=[:]
mylistData.id="087e7538583ee261944b66491391947d3a002380"
mylist.add(mylistData)

mylistData=[:]
mylistData.id="587ee2b1482509e12d5657bc55db70c9b482eddd"
mylist.add(mylistData)
def list=[]
//linesList=["587ee2b1482509e12d5657bc55db70c9b482eddd"] //contains 50 such values
for(item in mylist){
    item.pos=linesList.findIndexOf { it == item.id }.toInteger()
    list.add(item)
}
list.sort{ it.pos }
println list // list is not sorted
println list.sort{ it.pos }    // list is not sorted

Expected result:

[{id=587ee2b1482509e12d5657bc55db70c9b482eddd, pos=0},{id=bb007a1c9f594b55662a5b36d5f5b1a7651f3b0f, pos=19},  {id=087e7538583ee261944b66491391947d3a002380, pos=37},
{id=61628d82a174599d7ae7c61bf6d216f22d5139da, pos=45},{id=0cc18d6d3c93240ab93457063b4974a1270104c0, pos=54}]

Actual

[{id=61628d82a174599d7ae7c61bf6d216f22d5139da, pos=45}, {id=0cc18d6d3c93240ab93457063b4974a1270104c0, pos=54}, {id=bb007a1c9f594b55662a5b36d5f5b1a7651f3b0f, pos=19}, {id=087e7538583ee261944b66491391947d3a002380, pos=37}, {id=587ee2b1482509e12d5657bc55db70c9b482eddd, pos=0}]

Tried solutions

 list.sort{ it.pos }

Note: I am facing this issue while running inside jenkins

It's a CPS artifact, see here. For your sorting to work you need to put it inside a NonCPS annotated method:

...
println list // list is not sorted
sortByPos(list)
println list // list is sorted

@NonCPS
def sortByPos(l) {
    l.sort { it.pos }
}

Oh, and lists in groovy are sorted in place.