Incorrect multi-query results

1. Try executing DELETE... ; UPDATE ...; SELECT ...;.
2. Get result as an array of 2, where first element is an empty array.
3. Expectation is to get array of 3 results, like [[], [], [...]].
4. Somehow all empty arrays from DELETE, UPDATE, INSERT get merged into one.

const postgres = require('postgres');
	it('Multi-query', (done) => {
		const db = postgres.default(CONNECTION_STRING);
		const upd = /*sql*/`
			UPDATE "settings"
			SET "_json" = '[]'
			WHERE "setting" = 'test';
			--RETURNING "setting";
		`;
		const del = /*sql*/`
			DELETE FROM "settings"
			WHERE "setting" = 'test';
			--RETURNING "setting";
			`;
		const ins = /*sql*/`
			INSERT INTO "settings" ("package", "setting", "_json")
			VALUES ('test', 'test', '{}')
			ON CONFLICT ("package", "setting")
			DO NOTHING;
			--RETURNING "settings";
		`;
		const sel = /*sql*/`
			SELECT "_json"
			FROM "settings"
			WHERE "setting" = 'test';
		`;
		Promise.allSettled([
			db.unsafe(upd),
			db.unsafe(del),
			db.unsafe(ins),
			db.unsafe(sel),
			db.unsafe(del + del + ins + sel),
		]).then(([upd, del, ins, sel, all]) => {
			let success = upd.value.length == 0
				&& del.value.length == 0
				&& ins.value.length == 0
				&& sel.value.length == 1
				&& all.value.length == 4; // 4 sub-results: 0th, 1st, 2nd = [], 3rd = [{}]
			done(success ? undefined : all.value.length); // actually, all.value = [[], [{}]]
		});
	});

Start at the db.unsafe entry point and reproduce the multi-statement case from the issue using DELETE, UPDATE, INSERT, and SELECT queries. Done means the combined query preserves one result array per statement, including separate empty arrays for the write statements.