AggressiveAnimals 1.9.0 was certified for Paper and Spigot 1.20.6 and 1.21.

Changes:

• Updated build dependencies in SlimeDogCore and plugin source code
• Added a configuration option to make aggressive animals appear 50% larger while attacking
  • larger-when-aggressive
  • False by default, to maintain consistency with previous behavior

It is probably compatible with previous Paper and Spigot versions, but was tested only on 1.20.6 and 1.21