Savegame doesn't properly reinstate building upgrade queue

[adrian5]

I couldn't find this one among the issues list, apologies if it has been reported already.

Steps to repoduce

1. Instruct unit to upgrade building, e.g. taking a factory from 1 to 3.
2. Save game
3. Load game

Expected behavior

The building gets upgraded, as assigned before saving.

Observed behavior

The trucks don't commence to upgrade the building, and then sit idly.

[adrian5]

This issue persists (at least partially) – upgrading a factory by 2 modules is still reduced to 1 upon savegame resumption. I also still run into other building commands be forgotten upon save resumption, though I can't replicate that with a quick test on a newly started game. Not sure how involved a fix would be based on the current design.