Error occurred while loading Decorate mode

【Using google translate】

With one block painted with essence and a lot of furniture made from 4 x 4 x 4 cubes placed, the "Decorate mode" at the bottom right is loading, or if you just stay without doing anything, the Switch side An error will occur. Because the loading process could not keep up and an error always occurred, "Decorate mode" became permanently unavailable.

[Self-resolution]
Solution when I turned off auto-save.