btw are you sure we don't have this issue on Leap 15.2? we have the same version between 15.2 and 15.3, and I can see Recommends:(python-matplotlib-tk if tk) also exist in python3-matplotlib from 15.2 which python-matplotlib-tk was provided by python2-matplotlib-tk, so I suppose we should have the same issue on 15.2. And seems this issue in Factory is fixed until https://build.opensuse.org/request/show/863229 .