The age property can be used to prevent end gateways from producing their distinctive purple beam. It is a common practice to set the age of aesthetic end gateways to `-9223372036854775808L`

Such an age can be simulated with the vanilla command 

setblock ~ ~ ~ end_gateway{Age:-9223372036854775808L} replace

In previous versions of spigot, if a player's attempt to break an end gateway gets cancelled, the age persists. Unfortunately, in 1.19, that changed: cancelled player break attempts reset end gateway age, therefrom resulting in a purple beam.