The good news is YES, Microsoft have fixed all the issues that existed in build 17112; so the short version of the rest of this article is ... "go ahead and install this build".
Te ever-so-slightly longer version goes thus:
There are no new features in theis build, which isn't a surprise as this is a build from the Redstone 4 "release" branch, meaning the focus is on fixing issues ahead of the Redstone 4 public release, rather than adding in new features.
What's different though is that the Mixed Reality, Store & OneDrive major bugs from the last insider preview, are all now resolved, meaning we're getting closer to a final release build... which is just as well, as using Microsoft's 6 month rule as a guide, means we should be seeing a public build coming out this month (i.e. March).
Full release notes are here.