If you scroll to near the bottom of the guidelines tab, it gives a close example.
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All text fields within the app are already M3 text fields even if they do not appear like it. If there are any visual bugs, please attach a screenshot of the screen and what the issue/bug is.
This is what they look like on my screen.
These are M3 fields even though they do not look like it.
You would know better than me 🙂↕️