There are also very rare double Isis knot variants of apparently New Kingdom date1

Green enamelled steatite pierced twice vertically and inscribed backwards double Isis knot
Green enamelled steatite pierced twice vertically and inscribed backwards double Isis knot

Green enamelled steatite pierced twice vertically and inscribed backwards H 3.3, W 2.5, T 0.8 New Kingdom © 2012 Musée du Louvre/Christian Décamps #E 3707

Blackened blue glaze double Isis knot

Blackened blue glaze H 2.4, W 1.9, T 0.7 New Kingdom © 2022 Musée du Louvre/Antiquités égyptiennes #N 4570

Reference

1None, Unpublished amulets