From just a preliminary look at the logs it seems that you might have a bug on your hands. Just to be sure I would like to ask just a couple more questions before I submit the report to make sure that we are giving all of the information that we can to the devs.
- Is the engine downloaded from github or the Epic games launcher?
- where on your mac do you have the engine installed?
After I have that info, I will check it against the database to see if there are any current bugs that match this one. If not I will prepare a bug report for you and submit to the devs.
Thanks,