Index: src/main/java/net/minecraft/server/JsonList.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/main/java/net/minecraft/server/JsonList.java b/src/main/java/net/minecraft/server/JsonList.java
--- a/src/main/java/net/minecraft/server/JsonList.java	(revision 403d1f3f73eeb2b64054992d57aaacd68d0b4547)
+++ b/src/main/java/net/minecraft/server/JsonList.java	(date 1618244429374)
@@ -168,6 +168,11 @@
     }
 
     public void save() throws IOException {
+        //Steamwar Start
+        if (this.c.canWrite()) {
+            return;
+        }
+        //Steamwar End Don't write to unwriteable files
         this.removeStaleEntries(); // Paper - remove expired values before saving
         Collection<V> collection = this.d.values();
         String s = this.b.toJson(collection);