As the title implies, the attributes role="alert" and aria-live="assertive" are not working as intended with version Ventura 13.6.4 of VoiceOver.
I can't confirm exactly in what version did this issue first appeared, but I can confirm this is not a code issue since it works now with other screen-readers, and used to with VoiceOver.
You may quickly confirm this with online implementation examples of this property. Here is one:
https://a11y-solutions.stevenwoodson.com/solutions/aria/live/
Anyone else noticed this behavior? Any idea if Apple pretends to address this situation?