This issue is affecting my alliance for almost half a year now.
I posted this issue earlier here: https://forums.eveonline.com/t/sisi-disbanded-my-alliance/115132
Since the mirror in December, my alliance was disbanded again, this time showing the disband date of Dec 18. This is clearly a recurring issue and is preventing us from testing our sov and structure mechanics on the test server. Even if there is no immediate fix, I would appreciate contact from a dev to know that they are aware of this issue and confirm if there is a chance this will happen to my alliance on the Tranquility server.
Thanks for your time.