You can use EntityPathfindEvent to cancel new pathfinds from overriding your current

Spigot-API-Patches/0150-Mob-Pathfinding-API.patch

@@ -1,4 +1,4 @@
-From ff4b1d675da0e4955bae805d7ed579f3e8fb9238 Mon Sep 17 00:00:00 2001
+From 68606cfdc559ec3b89b3704a24247fd6774e0cb3 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Sun, 9 Sep 2018 12:39:06 -0400
 Subject: [PATCH] Mob Pathfinding API
@@ -9,6 +9,8 @@ This does not do anything to stop other AI rules from changing the location, so
 it is still up to the plugin to control that or override after another goal changed
 the location.
 
+You can use EntityPathfindEvent to cancel new pathfinds from overriding your current.
+
 diff --git a/src/main/java/com/destroystokyo/paper/entity/Pathfinder.java b/src/main/java/com/destroystokyo/paper/entity/Pathfinder.java
 new file mode 100644
 index 000000000..78230bd28