From ff925731031ef1421bba4f54e7697d507ba1d22e Mon Sep 17 00:00:00 2001
From: nexy7574 <git@nexy7574.co.uk>
Date: Fri, 12 Sep 2025 00:23:40 +0100
Subject: [PATCH] fix(hydra): Correctly create short state hash for <v12 rooms

---
 src/admin/debug/commands.rs   | 4 +++-
 src/api/client/room/create.rs | 9 ++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/admin/debug/commands.rs b/src/admin/debug/commands.rs
index 64f68330..0dac50dc 100644
--- a/src/admin/debug/commands.rs
+++ b/src/admin/debug/commands.rs
@@ -632,6 +632,7 @@ pub(super) async fn force_set_room_state_from_server(
 			.add_pdu_outlier(&event_id, &value);
 	}
 
+	info!("Resolving new room state");
 	let new_room_state = self
 		.services
 		.rooms
@@ -639,7 +640,7 @@ pub(super) async fn force_set_room_state_from_server(
 		.resolve_state(&room_id, &room_version, state)
 		.await?;
 
-	info!("Forcing new room state");
+	info!("Compressing new room state");
 	let HashSetCompressStateEvent {
 		shortstatehash: short_state_hash,
 		added,
@@ -653,6 +654,7 @@ pub(super) async fn force_set_room_state_from_server(
 
 	let state_lock = self.services.rooms.state.mutex.lock(&*room_id).await;
 
+	info!("Forcing new room state");
 	self.services
 		.rooms
 		.state
diff --git a/src/api/client/room/create.rs b/src/api/client/room/create.rs
index 0fe74b1b..adf69568 100644
--- a/src/api/client/room/create.rs
+++ b/src/api/client/room/create.rs
@@ -177,7 +177,14 @@ pub(crate) async fn create_room_route(
 	};
 
 	let state_lock = match room_id.clone() {
-		| Some(room_id) => services.rooms.state.mutex.lock(&room_id).await,
+		| Some(room_id) => {
+			let _short_id = services
+				.rooms
+				.short
+				.get_or_create_shortroomid(&room_id)
+				.await;
+			services.rooms.state.mutex.lock(&room_id).await
+		},
 		| None => {
 			let temp_room_id = RoomId::new(services.globals.server_name());
 			trace!("Locking temporary room state mutex for {temp_room_id}");