Apple Watch Series 12 and Ultra 4 missing handwashing timer feature

The new Apple Watch Series 12 and Ultra 4 lack the handwashing detection and timer feature, though it remains in watchOS 27 and works on Series 11 and Ultra 3. The reason is unclear: possibly a bug or hardware difference.

• Handwashing feature debuted in watchOS 7 in 2020
• Handwashing detection works on Series 11 and Ultra 3
• In watchOS 27, the feature and category in Apple Health are retained
• Series 12 and Ultra 4 got the first new processor in years