We have warned you about NOT using v11 in production. Here is a good example as to why.
There is a breaking change coming. It will trash your DBs unless you follow the instructions correctly.
https://bugs.koozali.org/show_bug.cgi?id=12982Please read the bug thoroughly. It shows you what to do to workaround this.
Note that this is why we build Alphas - we know there will be lots of things that break that may require massive workarounds or re-installs etc. That is all part of testing.
This should no longer occur after a Beta is released.