Been looking into this myself and somewhere on another forum I found loads of people running 11-46 on GRX 812 mech without issue.
Which one is the 812 one?
There's 11-32 and 11-42 versions but I don't know which is which.
11-34: 810/815 (Di2) 11-42: 812/817 (Di2) Also looks really ugly
@hippy started
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Been looking into this myself and somewhere on another forum I found loads of people running 11-46 on GRX 812 mech without issue.