In 1.13 (and possibly some versions afterwards) the "Render Distance" values loaded more chunks than in current versions.
This might be the same bug as
Run the following commands in 1.13 and in the current version.
- Set the "Render Distance" to 6
- Make sure you are neither near spawn nor in force loaded chunks
- Run the following to verify that spawning entities in unloaded chunks fails
It fails in 1.13 and in the current version as expected
- Run the following to check if the chunk 6 chunks away is loaded
It succeeds in 1.13, but fails in the current version