What ever happened to Ecumenism? Weren’t the various Protestant denominations only supposed to be “separated brethren”?
Protestants are “separated brethren”, not simply “brethren” because the churches are divided over various issues, including the Eucharist. Therefore, non-Catholics are not supposed to receive communion in Catholic churches (with a few, rare exceptions for Orthodox Christians, who wouldn’t receive anyway on account of their own rules).