I can confirm this issue on Windows 10. Worlds using symbolic links used to work on older snapshots, but 20w14a now throws an error when trying to load the world.
I also have a server running on Ubuntu 19.10 that stores worlds in a different directory and points to them using symbolic links. This has worked in previous versions, but now throws an exception when trying to start the server.
Jeff Hinshaw
I can confirm this issue on Windows 10. Worlds using symbolic links used to work on older snapshots, but 20w14a now throws an error when trying to load the world.
I also have a server running on Ubuntu 19.10 that stores worlds in a different directory and points to them using symbolic links. This has worked in previous versions, but now throws an exception when trying to start the server.