Multi-version/Bedrock support

This was only somewhat tested but it should be fine

Multi-version support (ViaVersion):

By default Spectrum Survival supports only one version of Minecraft just like Vanilla servers. You can change it by using ViaVersion (either as a standalone proxy (ViaProxy) or on Velocity).

Bedrock support (GeyserMC):

Spectrum Survival is a Java Edition only server. But by using GeyserMC (either standalone, Geyser-ViaProxy, or on Velocity) you can change that.