Pycharm doesnt show static fields while code completion using Qt5

Question

I am using PyQt5 (ver 5.15.6) While accessing some static fields like Qt.WindingFill Qt.NoBrush or QGraphicsItem.ItemIsSelectable the auto code completion (ctrl + space) doesn't show other options (it doesn't even show my option) while the interpreter can run the code successfully and after correctly writing the static methods name pycharm doesn't complain. Why is the reason ?

example code:

import math
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys

class QDMGraphicsScene(QGraphicsScene):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._color_background = QColor("#123456")
        self.scene_width, self.scene_height = 64000, 64000
        self.setSceneRect(-self.scene_width//2, -self.scene_height//2, self.scene_width, self.scene_height)
        self.setBackgroundBrush(self._color_background)

    def drawBackground(self, painter, rect):
        super().drawBackground(painter, rect)



class NodeEditorWnd(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.initUI()

    def initUI(self):
        self.setGeometry(200, 200, 800, 600)
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)
        self.setLayout(self.layout)
        # crate graphics scene
        self.grScene = QDMGraphicsScene()
        # create graphics view
        self.view = QGraphicsView(self)
        self.view.setScene(self.grScene)
        self.layout.addWidget(self.view)
        self.setWindowTitle("test123")
        self.show()
        self.addDebugContent()

    def addDebugContent(self):
        greenBrush = QBrush(Qt.green)
        outlinePen = QPen(Qt.black)
        outlinePen.setWidth(2)
        rect = self.grScene.addRect(-100, -100, 80, 100, outlinePen, greenBrush)
        rect.setFlag(QGraphicsItem.ItemIsMovable)
        text = self.grScene.addText("testtext")
        text.setFlag(QGraphicsItem.ItemIsSelectable)
        text.setFlag(QGraphicsItem.ItemIsMovable)
        text.setDefaultTextColor(QColor.fromRgbF(1.0,.7,.1))
        widget1 = QPushButton("hello wo")
        proxy1 = self.grScene.addWidget(widget1)
        proxy1.setFlag(QGraphicsItem.ItemIsMovable)
        proxy1.setPos(0,30)
        widget2 = QTextEdit()
        proxy2 = self.grScene.addWidget(widget2)
        proxy2.setFlag(QGraphicsItem.ItemIsSelectable)
        proxy2.setPos(0,60)
        line = self.grScene.addLine(-200, -200, 400, -100, outlinePen)
        line.setFlag(QGraphicsItem.ItemIsMovable)
        line.setFlag(QGraphicsItem.ItemIsSelectable)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    wnd = NodeEditorWnd()