Sounds like an invitation to attack the embassy doesn't it? An attack on the embassy would certainly call Irans bluff.If the Israeli soldiers are in the Iranian embassy in Beirut, that sounds like a decent ploy to keep that embassy from being bombed.
The Iranian embassy in Damascus, on the other hand, has no such impediments.
I would almost venture a bet that if the IDF surrounded the embassy like they did Arafat's compound, things would start to become unglued within the embassy.