Yeah ran into this too. Most of the restored boost buildings I care about are the quick-build ones so they build in 30 seconds. The Gauss Cannon and Defensive Force buildings take 24 hours so I'm doing those last.
On average, my impacted accounts lost about 8 boost building and 3-4 [good] cash buildings (didn't notice these since cash isn't a factor any more). The Anniversary Center buildings are 24-hour build by the way.
I spent [free] gold to finish placing the 24 hour build-time buildings.... I just want my stats back...... although I doubt they will be completely restored even when my boost buildings are back to max level.
I suspect a ton of valuable units were wiped out that will never return.