Auto-translated
How much are you willing to pay for a Tower at auction?
A Tower with a built 2nd level and one without are two different things.
In HotA, they slightly fixed the building chain, and the 2nd level is always built, so there are no problems with that.
But in SoD, the situation is such that in most cases, you only get 2 Nagas on day 6, and before that, you get unpleasant ranged units that put you in a dead end.
Therefore, there is little desire to pay for that.

UTC+03:00, icq 593626431