Interesting message I got from Google smart home test suite (emphasis mine)

Error: Refresh token has been rotated. This is not forbidden, however we do not see much benefit that rotating the refresh token can provide but the potential problem it has. We also tried to refresh token with the old refresh token after it has been rotated. Refresh didn't work, this means partner invalidated the old refresh token right after the rotation. Partners shall only invalidate the old refresh token after seeing we use the new one to ensure we got it successfully.

That sounds like good practice! It does not really help to rotate the refresh tokens.