Yes and no, there can be problems like world resseting, but probably that not happen. But i recoming you, create a server backup and download world.
Note: Switching from 1.16 to 1.16 or 1.17 to 1.17 is often not a problem. Newer Versions (1.15 - 1.17) to Old Versions (1.14<) is oft world deleting and new-world-creating. Sorry for my bad english. Bye