This is simply a bug report, not a support request!
TLDR: I was able to successfully set a static IP using the following command
ifconfig -a eth0 192.168.xxx.xxx 255.255.255.0
On my machine the GUI network manager doesn’t work. It looks like all is normal when trying to use it to change settings, but the changes don’t take effect after pressing apply. I found a slew of support requests on the forums here that outline various other ways to set a static IP, but they didn’t work either.