This is a simple plugin that aims to fix the bug on viarewind and viabackwards that any server on 1.20 with 1.8 clients connected glitchs on blocks and ladders.
This plugin uses reflection to fix that.
Just install ViaVersion ViaBackwards ViaRewind ViaRewindSupport and this plugin to allow maximium compatibility with 1.8 players on a 1.20 server.
I know this plugin is NOT for everyone. so use it only if you need it.