Canon had indicated it wanted to up the cadence of its firmware releases, perhaps even going monthly. Reality is hitting, and this update was supposed to see light a bunch of weeks ago. There were probably worse, more obvious bugs that they fire-drilled on, and this was missed. Fast cadence software development usually means accepting higher risk on testing, knowing you have a follow-on update a few weeks later. The firm I work for is as guilty of this as anyone. This usually - but not always - makes companies a bit more lax in initial testing, perhaps testing each individual new feature, but not necessarily comprehensively testing obscure combinations.