It almost looks like there is a distinction at play. There's the Straight Pool World Championship (not held since 1990), and the World Straight Pool Championship run by Dragon Promotions since 2006.
It reads like the Straight Pool World championships ran sporadically from 1912 to 1990. None of those were sanctioned by the WPA as it didn't exist until 1987). The BCA had world championships sporadically after 1948.
Then after a gap of 15 years with no world championship tournaments, the Dragon Promotions World Straight Pool Championship ran from 2006 to the present (except 2020). The 2006 event was the first Straight Pool Championship ever sanctioned by the WPA, and they also sanctioned 2007, 2008, and 2010, but none since.
If the WPA has only been involved in straight pool in four of the last 30 years, it's almost like it's not involved at all.
Didn't something similar happen recently in Chinese 8-ball or Snooker or something, where they referred to something as a World Championship, but the WPA or another sports organization didn't recognize it.