I had a look through the forum and I dont' think I can see this particular issue, but I hope that if it is, it can be merged in.
I've built a craft, all looks fine, but when I go to Launch the screen displays the image but doesn't load the launching scene.
I've had a look through the logs, and it looks like this gets triggered then the game gets stuck in a loop of the same sort of error, making the log balloon rapidly
[Debug] System.NullReferenceException: Object reference not set to an instance of an object
https://drive.google.com/file/d/1IfX32gf-h3HOk6QeVPwgta2lPigVQzPE/view?usp=sharing should be everything in backtrace
https://drive.google.com/file/d/1IcsjceQSD9j8myBZK5dykp9MzRUAiMRt/view?usp=sharing should be the player.log file