Gpu memory increase while using cv2.rectangle

Expected behaviour

cv2.rectangle not using gpu memory

Actual behaviour

Gpu memory increase while using cv2.rectangle

Steps to reproduce

>>> import cv2
>>> import numpy as np
>>> a = np.zeros((640, 640, 3), dtype=np.uint8)
>>> a = cv2.rectangle(a, [0,0,20,20], (255,0,0),2)

When using rect(x,y,w,h) to draw rectangle, I see gpu memory increase with nvidia-smi command
while a = cv2.rectangle(a, [0,0],[20,20], (255,0,0),2) does not produce this

Two version of opencv-python have tried: 4.8.0.74, 4.9.0

Issue submission checklist

• This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• I'm using the latest version of opencv-python

Start by reading the repository README to confirm whether this package toolchain can address the reported behavior, then reproduce both cv2.rectangle calls with the stated opencv-python versions. No repository file or test is named; done would be establishing whether the issue belongs in this repository or needs to be reported to OpenCV itself.