Maybe it feels different in the house itself, but...
14 total scenes
1 - Recap
Scenes 2 - 7
Season 2
2 - Arcade
3 - Bathroom/Byers house
4 - Tunnels
5 - Dustin’s Room and Bus
6 - Hawkins Lab/Bob Death
7 - Closing the Door Season 2 climax
6 scenes (I’ll let you argue 7 because of Dustin’s room)
Season 3
8 - Void/Transition
9 - Steelworks
10 - Hospital
11 - Hopper’s Cabin
12 - Russian Tunnel
13 - Starcourt
14 - “Credits/Russian Cell”
7 total scenes.
The way A&D designed the house, there’s more Season 3 than season 2. You can argue 50/50.
I think what’s throwing people in the early part of the house are the “half scenes;” scenes that aren’t full ideas on their own but allow more visual variation and story telling. Think of them as transitioning tricks, or an apron scene (a scene that occurs in front of the curtain while a set change is occurring).
It’s something Universal hasn’t really done before, but scenes 3 and 5 both feature them.