I'll take it a step back.
Without labelling one government or one party over another as being hypocritical, I will say that Canada has clear obligations under the United Nations Declaration on the Rights of Indigenous Peoples. That obligation is to align federal laws with indigenous self-determination through consultation and co-operation under the United Nations Declaration on the Rights of Indigenous Peoples Act. That's a clear obligation that arises under legislation, and continuing a known discriminatory transmission rule is inconsistent with those obligations.
Implementing a single-parent rule immediately—which is what's contemplated in the current draft Bill S-2—and expressly as an interim non-definitive federal measure, while enacting a consent-based opt-out pathway to first nations' exclusive jurisdiction over citizenship, would honour those duties. I don't see that step being taken currently in the legislation.