ViaVersion
How to allow multiple version to connect to a server
You can use:
ViaVersion
ViaBackwards
ViaRewind
You do not need to add ViaVersion, ViaBackwards, and ViaRewind on your Bungeecord. You only need them on your Spigot server(s).

You can use:
ViaVersion
ViaBackwards
ViaRewind
You do not need to add ViaVersion, ViaBackwards, and ViaRewind on your Bungeecord. You only need them on your Spigot server(s).

Updated on: 15/02/2023
Thank you!