I am using GRASS GIS 7.8 on Ubuntu 20.04. Currently working my way through a couple of tutorials. I am trying to display a raster from the command line using the d.rast command on a new monitor that I've opened up before (d.mon=wx0). In the shell there is no Error, however a new window pops up containing the following error:

Rendering failed: Expecting 720x480 image but got 720x456 image.

I am using the spearfish dataset from the GRASS GIS website and the raster I want to display is the spot.image. Any clew what might be the problem?