Allow breaking next to some liquids

src/api/java/baritone/api/Settings.java

@@ -107,6 +107,13 @@ public final class Settings {
      */
     public final Setting<Double> walkOnWaterOnePenalty = new Setting<>(3D);
 
+    /**
+     * Don't allow breaking blocks next to liquids.
+     * <p>
+     * Enable if you have mods adding custom fluid physics.
+     */
+    public final Setting<Boolean> strictLiquidCheck = new Setting<>(false);
+
     /**
      * Allow Baritone to fall arbitrary distances and place a water bucket beneath it.
      * Reliability: questionable.

src/main/java/baritone/pathing/movement/MovementHelper.java

@@ -77,7 +77,18 @@ public interface MovementHelper extends ActionCosts, Helper {
                 && BlockFalling.canFallThrough(bsi.get0(x, y - 1, z))) { // and if it would fall (i.e. it's unsupported)
             return true; // dont break a block that is adjacent to unsupported gravel because it can cause really weird stuff
         }
-        return block instanceof BlockLiquid;
+        if (block instanceof BlockLiquid) {
+            if (directlyAbove || Baritone.settings().strictLiquidCheck.value) {
+                return true;
+            }
+            int level = state.getValue(BlockLiquid.LEVEL);
+            if (level == 0) {
+                return true; // source blocks like to flow horizontally
+            }
+            // everything else will prefer flowing down
+            return !(bsi.get0(x, y - 1, z).getBlock() instanceof BlockLiquid); // assume everything is in a static state
+        }
+        return false;
     }
 
     static boolean canWalkThrough(IPlayerContext ctx, BetterBlockPos pos) {