The bug
The launcher_log.txt file contains multiple large (more than 9000 characters) lines which start with "[DATA]" and then contain hexadecimal characters.
It appears these do not add any value to the log file.
If they are logged on purpose, then please explain what the mean. Otherwise one could be afraid that this is security by obscurity and that when we tell people to attach their launcher_log.txt, that they are disclosing sensitive information.
Thanks for reporting this. I agree it is vague and it deserves a proper explanation and/or fix/change. I will open up an internal discussion about this immedately.