I'm new to this so I'll get that out the way. This might not be a bug, but it's an issue I noticed(as in my image. Take reference to the letters and arrows).

When I use item frames compared to Java edition, I can't put them right next to each other as if an item frame acts as a FULL BLOCK. When I placed an item frame on the wall (B on either side), the area is occupied not allowing me to be place an item frame on the floor (Where A shows the arrow to the blue block)
Same goes for the item frame on the ceiling(C). I can't have an item frame on the floor if one is on the ceiling. In the Conor of the wall I show that I can't place 2 item frames on the other colored blocks because the red one is on it already. Java Minecraft allows me to place them next to each other so I don't see why i can't do it here. I know this issue won't be an actual fix or patch, but I enjoy playing on Bedrock very much and figure I'd mention this since I was frustrated by it. Hopefully item frames can be next to each other? I don't know