1.4.22 / Migration Guide
4.22 Migration should be fairly straight forward.
New features mainly are the GrippablePhysicsReplication pathway on grippable actors (bUseClientAuthThrowing) and some overhaul of how grippable components handle replication on the back end.
*Edit* Also a bit into the 4.22 cycle I adjusted how IsHeld is handled to return an array of gripping controllers instead of a single one. To shift blueprints over to the new logic just use a setup like below.