Designers_Ink

Give this a look.  The attic wall type did not match up to the upper exterior (stucco) wall, so there was an offset.  It was an interior wall with drywall.  The roof plane cut into the wall, so I turned off the special snapping in the dbx for that lower roof plan.  That allows you to move that edge of the roof plane over so it doesn't cut the wall.  
 
Keep in mind, your upper wall is a thicker wall (2X6 stucco) than the thinner interior wall below it, so that thicker wall will be partially unsupported unless you do a 2X6 interior wall below it.  If you do a 2X4 stucco attic wall to fill in that triangle, you would have to shift that 2X4 interior wall over 2" so it would line up.
 
Hope this helps.
 
https://www.dropbox.com/scl/fi/tv1cxmisjou58jmqxh1qd/Custom-Home-4-modified.plan?rlkey=fwhhca3f9bjyzs1llljuqb3bq&dl=0

Use the rainbow tool on the screen material.  Then go to Properties and make sure your Emissive is set to 0.  It might just barely have any, but set it to zero.  You can then adjust the transparency in the same tab to fit what look you are going for.  See if that helps any.
 

There apparently is an issue with the 14900K and even in some cases the 13900K with the default settings on most motherboards.  When I started having issues, the first thing I did was reset all of the settings on my motherboard to the defaults hoping that would cure the issue.  I even replaced the ASUS motherboard with an MSI motherboard, but the issue persisted.  I spent many, many hours on the phone with various tech support centers to try to find a solution, as well as just trying everything I could to ensure there was not a faulty piece of hardware on the computer.  It was extremely frustrating.
 
Yesterday, I was reading some gamer forums since gamers tend to spend a lot of time tweaking their systems.  I found a thread that dealt with crashes with the 14900K i9 CPU.  They were having crashes in several games when the GPU (graphics card) kicked in with a high load on the power, especially when an RTX 4090 card was in use.  They had found that the default settings for the Performance Active-Core Ratio (P-Core) on most motherboards was set to around 57x.  They suggested backing that down to 54x to resolve the issue using the Intel Extreme Tuning Utility App.  
 
I downloaded the software and changed each P-Core from 57x to 54x and rebooted.  After about 6 hours of continuous use and many refreshes of the plot line elevations, I have not had any crashes.  I hope this helps someone who might be having similar issues, so they don't spend an exhaustive number of hours trying to pinpoint a solution like I did.  
 
 
 
 

You have at least one wall that is marked "No Room Definition" in the wall DBX.  Just select all of the walls and open the dialog.  There will be a dash next to that setting.  Click it until the box is empty, and you should be good.

Turn your sunlight down to about 300 and see if that fixes it.