All summons besides the first level seems to have been changed and thusly broken. The combat log corresponds with the stat sheet. Even attacks per round was bugged when I tested it.
What exactly did you test? Can't you only cast up to level 3 spells?
Yes. I tested each of the summon levels up to 3. Level II summon, Greater Living Branch and Level III Insect Swarms. AB and APR were off. For the Level three the hps were almost half.
The manner of testing was having it face other summons/opponents and watched the combat log. So I cannot say for saves and such as I don't remember what they were beforehand and didn't really have a way to test them.