Paper/paper-server/patches/unapplied/net/minecraft/server/commands/DeOpCommands.java.patch

--- a/net/minecraft/server/commands/DeOpCommands.java
+++ b/net/minecraft/server/commands/DeOpCommands.java
@@ -35,7 +35,7 @@
             if (playerList.isOp(gameProfile)) {
                 playerList.deop(gameProfile);
                 i++;
-                source.sendSuccess(() -> Component.translatable("commands.deop.success", targets.iterator().next().getName()), true);
+                source.sendSuccess(() -> Component.translatable("commands.deop.success", gameProfile.getName()), true); // Paper - fixes MC-253721
             }
         }