Please refer to Feedback report: FB19701007
The Personal Voice file created in English changes to either Spanish or Chinese and no longer works properly. This has been happening since Beta 1 of iOS/iPadOS 26.
I have been unable to pinpoint what causes this to occur. Possibly downloading foreign voices to a device or using different voices via AVSpeechSynthesizer.
I run an app in Xcode on my device that prints to the console info about the installed voices. Initially after creation here is the output:
Voice Identifier: com.apple.speech.personalvoice.16173F8D-DFB0-4024-98CC-69D965FD96A4 Language: en-US
Then I hear a Spanish accent and find this:
Voice Identifier: com.apple.speech.personalvoice.16173F8D-DFB0-4024-98CC-69D965FD96A4 Language: es-MX
Currently it isn't working and here is the output:
Voice Identifier: com.apple.speech.personalvoice.16173F8D-DFB0-4024-98CC-69D965FD96A4 Language: zh-CN
Note that the voice file on all three above is the same. No matter what the user does, the created voice file should never be able to change languages. On my test devices I reset them all by erasing all content and settings and creating a new English Personal Voice and the issue persists.
A side issue is the toggle share across devices doesn't remain off if turned off. I tried to not share to see if that could be the cause, but the toggle turns on automatically. It won’t remain off.