Please help me.. File is abnormally large and can't be exported to moc3

I haven't had this error in two years, so I'm embarrassed.
I'm using the 4.2.03, not the free version.
Export takes more than 30 minutes to load before the notification window disappears.




Illust : 212MB
size : 8000x9450 but I worked 1/2 (4000 x 4725 px / 376MB)

.com3 file size : 2,809,093KB
I think the capacity keeps increasing when I open and close the file..

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Live2D Software Version: Cubism Editor 4.2.03_2)
OS & Version: Windows 10
PC Model: custom pc
Video card: NVICIA GeForce RTX 3090
CPU: AMD Ryzen 7 5800X
Memory(RAM): 48GB
Illustration Software used:ClipStudio
Connected monitor: AOC Q27G2WG4, Samsung LS27AG32x, Wacom Tech Cintiq 22

- Log file
I have attached a file.

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I searched for QnA and tried everything, but it didn't work out. (Texture size reduction, overall ratio reduction, canvas reduction)

As a test, I erased all the parts except for the head and updated them
From 2,813,811KB to 2,807,033KB. One head can't have this much capacity.. Can we fix this error? please help me..