If you have old tech tree - you see old spell order, if new - new.
Game loads 2 files with buildings for me now: first, main one, contains MA with old spell order, and then loads a small file attached to new tech tree test group which has MA with new spell order. As far as I understand the logic - that file should contain buildings with lower costs to speedup first chapters, but why it has MA with a different spell order inside?
Ah, I understand why...
Old spell order is the order spells appeared in game historically - CC was the last one.
New spell order is the order you get them in research tree.
That makes sense, but transition was done badly:
Those who stockpiled not collected CCs for upcoming FA got a bunch of IM instead.
Those who have few CCs there and normally produce MMs without collecting to be able to finish any event quest lost all their produced MMs which has a very limited income, + lost a lot of production time (MMs has longer production than CCs, replacing MMs with CCs is a plain time loss).
Seems same was done on live servers (not for everyone, for test groups) with the same results... Even without proper announcement, so that everybody could at least collect everything they have in queue before that change...
Wonder if they have the same issue with optional techs from chapters 1-5 become suddenly researched even if they were skipped on purpose.
Or it was just to check if someone cares about it or not?