This has already been hotfixed. It is actually an easy change. Please open up GraphEditor.cs and add these lines of code on the top of the “targetOwner” property.
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privatestaticGraphOwnertargetOwner{
get
{
if(current==null){//this fix the maximize/minimize window
current=OpenWindow();
}
///Rest of code bellow
Let me know if that indeed works for you.
Thank you!