I tried to shoot during the evening time, and I think my m50 doesn't deal very well with low light environment. Even if I had set my aperture at f1.8, I still had to increase ISO above 1000, which did affected a lot my images. I must try this with my 7d m2, to test it.
Well 1000iso is a high value. In high iso you shoot with applied gain to the received information of the sensor. This means that the signal is amplified from the processor which results in inherited noise from this in camera processing. It is normal to have issues with noise at iso 1000.
Even with FF cameras happens but in a smaller scale due to larger pixel pitch in case you compare it with the same pixel resolution...