While doing some tests with release 1.5 on the supported UE4 releases:
- 4.17: new features OK, optimizations OK
- 4.18: new features OK, optimizations OK
- 4.19: new features OK, optimizations 3/4 OK
- 4.20: new features 9/10 OK, optimizations 3/4 OK
- 4.21: new features 8/10 OK, optimizations 2/4 OK
- 4.22: new features 7/10 OK, optimizations 2/4 OK
- 4.23: new features 7/10 OK, optimizations 1/4 OK - an issue is said to be fixed for next preview and final release: Unreal Engine Issues and Bug Tracker (UE-77601)
so, we are diligently working on fixes and workarounds for the found issues at 4.19, 4.20, 4.21, 4.22 and 4.23. First, we will try to make the fixes and workarounds specific for each release and propagate to the later releases, second, we will see if these fixes and workarounds works fine if present in earlier releases, ensuring every release user has exactly the same code running, which reduces the work in case of upgrading project with newer releases.