Edit for clarity:

On this and on other joins, this return type overrides any previous joins. By that I mean if I have a table A, and I join table B and then I join table C, when I go to select the columns I want I only have access to columns from table A and table C. This means if I want columns from all three tables I have to join to table B, select columns from it then join to table C and select columns from it. if the return type was ITypedQueryBuilder<Model, AddPropertyWithType<_SelectableModel, NewPropertyKey, NewPropertyType | null>, Row> all joined tables would be selectable when you got to choose what columns you want.