For n⩾4$n\geqslant 4$, we show that there are infinitely many formally contact isotopic embeddings of false(ST∗Sn−1,ξstdfalse)$(ST^*S^{n-1},\xi _{\rm {std}})$ to false(S2n−1,ξstdfalse)$(S^{2n-1},\xi _{\rm {std}})$ that are not contact isotopic. This resolves a conjecture of Casals and Etnyre (Geom. Funct. Anal. 30 (2020), no. 1, 1–33) except for the n=3$n=3$ case. The argument does not appeal to the surgery formula of critical handle attachment for Floer theory/SFT.