In a dream, I saw I was dead and in the grave. Then Shaykh Hisham Kabbani asked me how many questions were asked to you? I said 2 and who is your prophet was not asked.
As-Salāmu `Alaykum wa rahmatu l-lāhi wa barakātuh
It is a very good dream that indicates that you will reach the spiritual station of dying before you die (mootoo qabl an tamootoo) insh Allah through the spiritual guidance of Mawlana Shaykh Hisham Kabbani.
Mawlana Shaykh Hisham also taught us that if you see that you died in a dream it means Allah extended your life. You die in a dream to extend physical life al Hamdulillāh!
The question about Prophet ﷺ missing shows a deficiency which needs improvement to reach that high spiritual station. You need to focus more on Prophet ﷺ more by increasing your daily recitation of salawat on Prophet ﷺ and keep His ﷺ sunnah externally and internally.
And Allah knows best!