diff --git a/web/pcbjam-shared b/web/pcbjam-shared
index 6189307..f8feab8 160000
--- a/web/pcbjam-shared
+++ b/web/pcbjam-shared
@@ -1 +1 @@
-Subproject commit 6189307bf50a3fc1d477f0616434e8c9e2f980b9
+Subproject commit f8feab8f8ac66a6a0bf5fa7dd1e83bf0d24b7d8d
diff --git a/web/standalone/src/wasm/collab/provider.ts b/web/standalone/src/wasm/collab/provider.ts
index 42b6f45..a87869d 100644
--- a/web/standalone/src/wasm/collab/provider.ts
+++ b/web/standalone/src/wasm/collab/provider.ts
@@ -91,7 +91,12 @@ async function partyKitProvider(
   params: ProviderConfig["params"],
 ): Promise<YjsProvider> {
   const { default: YProvider } = await import("y-partyserver/provider");
-  const provider = new YProvider(endpoint, room, doc, {
+  // The provider splices the room into the WS URL verbatim, so it must travel
+  // as ONE percent-encoded path segment — otherwise a docPath containing
+  // `/`, ` `, `#`, `%` or `?` truncates or corrupts the room name. The sync
+  // worker decodes it once at its edge; the decoded string is the canonical
+  // room/DO name everywhere.
+  const provider = new YProvider(endpoint, encodeURIComponent(room), doc, {
     party: PARTYKIT_PARTY,
     connect: true,
     params,