Sorry - cannot reproduce this - but you are right this is somewhere in clutter/mutter . Can you tell me a bit more about your setup.
Is this a virtual machine - if so what virtualisation solution are you using - how have you configured your VM.
Is this a real machine - if so, what graphics card and graphics driver are you using - nvidia? have you got animations switched on/off in budgie-desktop-settings (it should be off).
Can you reproduce this if you boot into a live session of 19.04 Ubuntu Budgie (download the latest daily image)?
Sorry - cannot reproduce this - but you are right this is somewhere in clutter/mutter . Can you tell me a bit more about your setup.
Is this a virtual machine - if so what virtualisation solution are you using - how have you configured your VM.
Is this a real machine - if so, what graphics card and graphics driver are you using - nvidia? have you got animations switched on/off in budgie- desktop- settings (it should be off).
Can you reproduce this if you boot into a live session of 19.04 Ubuntu Budgie (download the latest daily image)?