I do see usages of which in these cases only with the addition of prepositions to tie things together more cohesively.
Take the example case: “Upon the submission of the cause the appellant made a motion to amend its assignments of error, which motion is now granted.”
In 2023, I would expect this to read “Upon the submission of the cause the appellant made a motion to amend its assignments of error, in which motion is now granted,” where “in” is the change.
Take the example case: “Upon the submission of the cause the appellant made a motion to amend its assignments of error, which motion is now granted.”
In 2023, I would expect this to read “Upon the submission of the cause the appellant made a motion to amend its assignments of error, in which motion is now granted,” where “in” is the change.