I tried running 17w50a for the first time today and when creating a new single player world the mincraft window just crash after "preparing the spawn area"
The same world works perfectly fine in 1.12.2.
Even when creating an other world it won't work.
Then I tried making an world in 1.12.2 and opening it in 17w50a that didn't work either.
When you watch the video and see the crash report from mac os it is the pastebin link.
https://pastebin.com/hpFx28hg
Unfortunately i will be going away for about 2 weeks and wont have access to internet that's why I probably wont respond that quickly.
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It seems like that bug can open the single player world but I can't at all open any single player world even when looking at the air.
And at the end of the comment session Ezekiel (mod) says that it has been resolved in 10.13.2 build 17C88 but im running 10.13.3 Beta (17D25b) which is later than 10.13.2 so that should have been fixed not introduced again in 10.13.3 Beta
Judging by the fact that 17C88 is the latest public release, I can only assume this is caused by macOS betas in general. @unknown in MC-121323 also said that installing the GM fixed the issue. I don't use macOS, so you may have to ask someone in that ticket.
This is caused by a beta macOS build. See MC-121323.