This genus of butterflies is widespread throughout the world, with the exception of most of Europe, in the south they are. I've photographed them in Africa so I had to take a closer look at your sighting. It's a striking butterfly and Indonesia is a long way from where I live and photograph. Too bad I have so little time to read the posts.
Previously I also very rarely saw this butterfly, especially in my village, but lately butterflies seem to have migrated to my area, because I almost see this butterfly in every garden that I visit.
Thank you very much for your support and good comments, have a nice day my brother ♥️