If there are insufficient materials carried when using /UP 2 for the first time, the building will be upgraded by half. However, if I gather the materials and use /UP 2 for an upgrade again, it will show that there are no buildings available for upgrading.

Then players provided feedback that when unable to upgrade the display, they suggested directly upgrading to a wooden building and then upgrading to a stone building, which worked again. However, after a while, it automatically reverted back to the original wooden house.

Never had any building revert back ?, I do not have any problems with partial upgrades as this happens a lot when i do not have suffiecient materials in my inventory . but when i replace those materials it upgrades with no problem,