Having this weird issue where it's like my APFS container that I'm booted into is not mounted? (hackintosh)
First question, what version/build of OS X are you on? Is FileVaut enabled? Also you say you are booted into /dev/disk1 which is actually the container at disk0s4. If you are making partition changes, it is best you do not do it from the disk you are modifying, especially with a table like this.

APFS from my findings is really unstable still, and while it has some advantages, there are a lot of problems, and when they happen, they are hard to recover from. 

Paste the output of diskutil apfs list. Make sure you do a direct copy and paste, not just from memory.

Also, make yourself a recovery drive to boot from when you make any changes, if you can even install a clean copy of Mac onto a USB3 and run it from there so you also can see how things appear in Finder, otherwise just a simple drive using createinstallmedia is fine. Link to the help on that is below. 

https://support.apple.com/en-us/HT201372