Ok, very strange definitely. I didnt get yet Project launched. TrueSky plugin seems to be crashing the packaged build (edit: found out I need to copy-paste certain files to packaged build folder, but deleted it too early). Will take time to see if its only thing left, that prevent the launch.
Edit: Found out day or two old stagedBuild (packaged without BP compilation manager) and it started working already with the truesky trick. No issues with pooled characters with it. Soon testing with new packaged Project, but seems like there is no real issue. 