I've been wondering if "Iran" the country is able to speak with one voice these days. The New York Post has a story that suggests the answer is "not always."
Shortly after the MOU was signed the IRGC messaged the Strait was closed due to violations of the treaty, while the Foreign Ministry said the Strait was open.
The differing messages mirrored internal divisions in Iran over whether it should keep fighting the US or seek a truce — strife American and regional sources have cited as a significant reason why it took roughly two months of negotiations for finalize the MOU.
One presumes the Foreign Ministry has the interests of Iran at heart while the goals of the IRGC are pan-Shia Islamic and ideological/religious, viewing Iran as a current base-of-convenience, not as a homeland.