[stable2506] Backport #8861

polkadot/runtime/parachains/src/inclusion/mod.rs

@@ -615,8 +615,12 @@ impl<T: Config> Pallet<T> {
 				}
 			});
 		}
-
-		(weight, freed_cores)
+		// For relay chain blocks, we're (ab)using the proof size
+		// to limit the raw transaction size of `ParaInherent` and
+		// there's no state proof (aka PoV) associated with it.
+		// Since we already accounted for bitfields size, we should
+		// not include `enact_candidate` PoV impact here.
+		(weight.set_proof_size(0), freed_cores)
 	}
 
 	/// Process candidates that have been backed. Provide a set of

prdoc/pr_8861.prdoc

@@ -0,0 +1,10 @@
+title: "paras_inherent: fix overweight warn"
+
+doc:
+  - audience: Runtime Dev
+    description: |
+     This fixes an incorrect warning in the relay chain runtime
+
+crates:
+- name: polkadot-runtime-parachains
+  bump: patch