For 12 of the past 13 days, no Chinese military flights were recorded near Taiwan. By CHRIS BUCKLEY Taiwan has grown accustomed to a near daily drumbeat of Chinese military planes flying close by, part of Beijing’s campaign to pressure the island it claims as its own. But lately, Taiwan has been facing an unexpected puzzle: Where have the planes gone? For 12 of the past 13 days, no Chinese military flights were recorded near Taiwan. The sole exception was Sunday when two planes were seen…