This makes the addon work on 1.14. There were 2 issues:
world creation needs to be done with a lower-case world. Note that this doesn't mean that a new world is created because world naming is apparently case-insensitive
The block populator was setting the block type with physics = true (the default). With 1.14 this would cause the server to go into some kind of infinite loop and freeze. Setting blocks with physics set to false fixed the issue.
This makes the addon work on 1.14. There were 2 issues:
https://github.com/BentoBoxWorld/CaveBlock/issues/22