I find another bug. When you modify your file and try to save it with Cmd + S or File Save command. Instead of saving the file it open the same file in a new tab without saving the file.
It is not opening the same file, it is opening the layout page (layouts/login) to update the head. I found the problem that it didn’t save the file (it works after you save a second file when the layout page is open). Will be fixed in the next update.