Confirming that the following steps resolved the issue for me:
Take an icloud backup (of the ios18 device)
Reset all content and settings (except for esim)
Restore icloud backup on reset device
This seems to clear any screentime settings when the device is reset and the backup is restored. My device is setup as a main device (not sure if this would work on a family/parental controlled device)
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Was so excited when I saw Beta 2 drop, but this issue is still happening. Clicking on screentime in settings does nothing - clicking ignore for today or ignore for 15 also does nothing.