Vulture droid

"Thufir;d-255997" wrote:
So what’s going on with that. Assists on enemies with buzz droids is random nowadays. Did something change?

Summoned droids always had only a chance (I think it was 70%) to assist. Unfortunately you can read that text only if you check the Unique of a summoned unit in battle.
However there are bugs and they almost never assisted recently. There are also issues where Plo koon enters, but the Buzz droids are still visible (but seem to be gone as these ships don't lose health or are attacked by assisting vultures).