The first scene of Game of Thrones S08E06 is showing us shortly after the battle in the previous episode. Immediately after that, comes the
death of Dany from Jon Snow.
Immediately after the scene with Drogon we cut to a scene with Tyrion being led out of a cell, then to his trial at the Dragonpit. This is where things get confusing -- during dialogue he mentions something along the lines of "I've spent the last few weeks thinking about ...", which would imply only a few weeks passed between the end of the battle at King's Landing and his trial, but the weather is clearly not winter, where at the start of S8E1, it was clear winter was still there. And King's Landing looks visibly in no less condition than it was pre-destruction -- even the docks and the surrounding city buildings all remain intact.
So how much time exactly passes during this entire episode? I'm having trouble justifying that it spanned only a couple of weeks, yet the Unsullied holding Jon and Tyrion hostages seems even more unlikely.