Combination Matrix Disappears if coord_flip Plot Rotation is Applied

[DarioS]

I would like to rotate plot by 90 degrees for better A4 page fit. But that causes the combination matrix to go missing.

tidy_movies %>% distinct(title, year, length, .keep_all=TRUE) %>% ggplot(aes(x=Genres)) + geom_bar() +
scale_x_upset(n_intersections = 20) + coord_flip()

Is it a bug? If so, may it be fixed?