According to the release notes for 1.17 (https://www.minecraft.net/en-us/article/caves---cliffs--part-i-out-today-bedrock), the command /whitelist has been renamed to /allowlist. However, if you actually start a dedicated server, you will see that /whitelist still works and /allowlist is not recognized as a valid command.

steps to reproduce:

1. start a server
2. type allowlist list
   •  the server responds with something like

     Unknown command: allowlist. Please check that the command exists and that you have permission to use it.

1. type whitelist list
   •  the server responds with something like

###* {"command":"whitelist","result":[]}
 *###

even though this command should be removed in favor of allowlist