MidEast ceasefires are always iffy, and never as complete as one would want. As the president says, “we’ll see what happens.”
One thing we need to keep in mind here is that the government of Iran is likely in extreme disarray.
One hand likely doesn’t know what the other hand is doing. There are likely high level people engaging in vicious infighting, those doing the negotiating are likely being physically threatened with death by hardliners who want to fight to the death and so on.
This doesn’t surprise me that much.