After a little verification, it is possible that my mod does not save the size to the guild card, as it did not update the size even when extremely large. However, if you use a custom quest, the size will be recorded.
If the only concern is that it will be saved to the guild card, one means is to turn off the autosave and exit the game without saving after experiencing the Lagiacrus mod.
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However, if you use a custom quest, the size will be recorded.