We are modifying our preview process to release earlier in the development cycle so our developer-community can help us catch issues sooner, and we will release updated previews during the development cycle.
Please be aware that the preview releases are not fully quality tested, that they are still under heavy active development, and that they should be considered as unstable until the final release. Developers should not convert their projects for active development on preview releases. Please test on copies of your project instead.
Thank you,