The Mikado wasn't staged in Japan until after World War II.

There is an interesting story: the revival of The Mikado in the UK in 1907 was banned for six weeks during the visit of Prince Fushimi to Britain on diplomatic business on fear that a show that, on its surface, mocked the Emperor of Japan would offend the Japanese dignitaries. Prince Fushimi apparently expressed disappointment over not getting to see the show.

My source is The Complete Annotated Gilbert And Sullivan, by Ian Bradley.