Apple’s long-promised AI overhaul for Siri runs into bugs, possible delays

Apple Inc.’s long-promised overhaul for the Siri digital assistant is facing engineering problems and software bugs, threatening to postpone or limit its release, according to people with knowledge of the matter.

The company first unveiled plans for a new AI-infused Siri at its developers conference last June and has even advertised some of the features to customers. But Apple is still racing to finish the software, said the people, who asked not to be identified because the situation is private. Some features, originally planned for April, may have…