I'd like to apologize if you've had this missing chunk bug pop up recently.
Edit: This has been patched now! (leaving the rest intact for reference)
If I can't fix it by the end of the day we may roll back to the previous version. Please Check the comments here to see if it's been fixed. The chunks aren't actually missing, and I have some idea of what might cause them not to load. Thank you for your patience in dealing with this. And please don't hesitate to tell me if there are other important bugs here, or email email@example.com. I am a solo developer, so it can be difficult to playtest on my own, and I might not be aware of the issues you're having, even if they're major or obvious like this, it can slip by.
Sorry again, doing my best