This will hopefully be the last pre-release before releasing 2.0.0 proper.
We have recently closed the last of the sanitizer and static analyzer bugs I am aware of, and the few bugs we have seen recently are corner cases in regards to the build system not building properly on platform X or with compiler Y, etc.
We do have a couple failing CI tests, but both of those are AFAICT a problem with the tests and not with zlib-ng itself.
We plan to release the final 2.0.0 version in 2-3 weeks, unless we see bug-reports that warrant postponing the release.
PS: This release candidate was re-released with a couple SOVERSION fixes that were only detected after the initial attempt.