1.12.15 - Send packs in configuration phase on Velocity
This adds support for sending packs in the configuration phase which was added in 1.20.x on Velocity. This means that packs can be sent before the player actually joins the server! In order to enable that make sure your send-delay is set to 0 or not defined! (And if you have issues with it set it to 1 or a higher value. Please report those to me too as the API is extremely new!) This update requires Velocity build 399 or newer! There is no support for older Velocity versions!
Support for this on Spigot & Bungee will follow at a later date once they have API or I can figure out a good way to do that without API