Numpads give no input with frustrating NumLock status in Plasma 6

I updated to plasma 6.0.2 recently. When i enables NumLock in one application before switching to another one, the numpads (0-9 and dot) fails to give any inputs (nor the arrows) with NumLock light on. I have to turn the light off to use numpads in some cases. I also rolled back to plasma 5 to test. This bug does not appear in my plasma 5. (neither X11 nor Wayland produces this bug)

The bug is recorded here: youtube .com/watch?v=U3djIJhW5xk

I dont know why i cannot post it directly so sorry for the inconvenience