TextToSpeech crashing Safari?

I'm using a 2020 27" iMac (Intel Core i7) running Sonoma 14.5. The issue started about 6 days ago, which doesn't correlate with any macOS updates or new app installs.

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Every browser crashes with certain websites (e.g. LinkedIn, ChatGPT, AlternativeTo.net). The crash reports suggest the TextToSpeech framework is involved.

I've tried, with no success:

- Using a Private Browsing tab

- Using a different Safari profile

- Turning off all Safari extensions

- Clearing caches, cookies, and history from Safari

- Running my Mac in Safe Mode

- Removing all Login Items and restarting

- Resetting PRAM and NVRAM

- Running Onyx maintenance scripts

- Running CleanMyMac X maintenance scripts

- Deleting all the plist files in my User Library that include Voice or Speech in the file name

The issue does not affect other users on the same Mac

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The Console also shows VoiceOver Utility, MauiAUSP, MacinTalkAUSP, and axassetsd have crashed multiple times.

If I go to System Settings > Accessibility > Spoken Content, I don't see the preference pane. A pop-up says: Extension Process Accessibility (2518) exited, or Extension Process Accessibility (3452) exited.

I put the VoiceOver Utility crash report into an AI assistant and got this feedback:

- The crash was likely caused by an unrecognized selector being sent to an instance of NSNull, resulting in an NSInvalidArgumentException.

- The crash occurred during the process of loading voices for the speech synthesis framework, specifically in the -[BabelFish allVoices] method.

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Does anyone have any thoughts for what could help resolve this?