When I start the server, I get the following before it starts working.  I've seen other questions similar, but not seeing a resolution, or if one is in the works.

Last login: Sun Aug  2 19:00:58 on ttys000

shawnbailey@iMac ~ % /Users/shawnbailey/Desktop/MC\ Server/start.command ; exit;

[16:07:26] [main/INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', name='PROD'

[16:07:27] [main/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]

[16:07:27] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]

[16:07:27] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]

[16:07:27] [main/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]

[16:07:27] [main/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]

[16:07:27] [main/INFO]: Reloading ResourceManager: Default

[16:07:29] [Worker-Main-4/INFO]: Loaded 7 recipes

[16:07:29] [Worker-Main-4/INFO]: Loaded 927 advancements

[16:07:30] [Server thread/INFO]: Starting minecraft server version 1.16.1

[16:07:30] [Server thread/INFO]: Loading properties