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TotalShanner
I seem to remember reading (maybe on road.cc?) the r7000 long cage RD was made to work with cassettes up to 40 or 42 a while back - think it was a pre-GRX article on how to gravelize Shimano's then current offering.
EDIT: here's the write up https://road.cc/content/feature/how-get-ultra-low-gearing-gravel-bike-adventures-246424