Hi,
I've noticed a bug related to one of the recent versions of matplotlib (at the time of writing). The error is raised when I draw the upsetplot using this line:
d = upset_obj.plot(fig=fig)
I've traced it back to the "legend.py" script of matplotlib 3.10.0, in which the following lines cause the issue:

    labels = [*reversed(labels)]
    handles = [*reversed(handles)]
if len(handles) < 2:

TypeError: object of type 'list_reverseiterator' has no len()

The issue is not present in matplotlib v3.9.2 since legend.py did not feature these lines.
Help much appreciated!