Instead of just upgrading once, a tower will upgrade as many times as is possible given the current amount of gold. This only applies to the early combinations (i.e. Silver, Malachite, and Fire Star). This is directly related to the following commit: 4ce87f14ba3bd5443e84c88de5b12cd020e339b5.
The behavior dealing with unit scaling was split out of that file, but the event causing that behavior to fire was not disabled.
Instead of just upgrading once, a tower will upgrade as many times as is possible given the current amount of gold. This only applies to the early combinations (i.e. Silver, Malachite, and Fire Star). This is directly related to the following commit: 4ce87f14ba3bd5443e84c88de5b12cd020e339b5.
The behavior dealing with unit scaling was split out of that file, but the event causing that behavior to fire was not disabled.