QAbstractItemModel.parent index.internalPointer returning wrong object

[elveatles]

I'm not sure if this is a PySide bug or if I'm doing something wrong.
I have subclasses a QAbstractItemModel to use with a QTreeView. When I try to refresh the children on an item, I get errors that don't make sense and sometimes crashes.

Here is my override parent method:

def parent(self, index):
        if not index.isValid():
            return QModelIndex()
        
        childItem = index.internalPointer()
        parentItem = childItem.parentItem
        
        if parentItem == self._rootItem:
            return QModelIndex()
        
        return self.createIndex(parentItem.row, 0, parentItem)

Here is my refresh method:

def refreshChildren(self, index):
        item = index.internalPointer()
        
        self.beginRemoveRows(index, 0, item.childCount() - 1)
        item.clear()
        self.endRemoveRows()
        
        self.beginInsertRows(index, 0, item.childCountAfterRefresh - 1)
        item.addChildren()
        self.endInsertRows()

I call refreshChildren from setData which looks like this:

def setData(self, index, value, role=Qt.EditRole):
        if not index.isValid():
            return False
        
        item = index.internalPointer()
        
        if role == Qt.EditRole:
            item.setData(index.column(), value)

            if index.column() == versionColumn:
                self.refreshChildren(index)
            
            return True
        else:
            return False

I always get an error in the parent method on the line parentItem = childItem.parentItem because parentItem isn't the custom item object that I created. It's another one of the objects inside of the item object. But this error only happens after I refresh. Thank you for any help.