I've added the video instructions you shared to the main post, thank you so much!
My friend and I will try this today too.
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Is this issue for large house even being addressed? I see a sticky on top for items disappearing under 400 placements, but what about large houses and how we can't make use of the MAIN FEATURE of the large house which is the tall cealing build? priorities set by floor so if we're on the first floor and look at 2nd floor, all lights disappears, if we're on the 2nd floor and look down at 1st floor, all lights disappear....... I'd rather have it reverted back to 400 limit, was this never even a consideration for large houses because there are so few large house owners?
Good news! they gave us 600 more item slots but can only display 400 of them. Sounds a lot like a monkey paws wish come true!
So my guess about large houses turned out to be true? If wrote to support about 2 problems, items culling on same floor and when you running between the floors. Seems like L-house central area counting as 2...
Funny thing, i heard mod makers already fixed 400 objects culling problem (well, they just switch it OFF as i read on their site). This solution is still better than leaving things as is. If Square Enix doesn't fix this in the future, I hope they'll at least add the option to manually disable it..