fix(plugins): preserve empty provider scopes

src/plugins/loader.ts

@@ -358,7 +358,8 @@ function buildCacheKey(params: {
       },
     ]),
   );
-  const scopeKey = JSON.stringify(params.onlyPluginIds ?? []);
+  const scopeKey =
+    params.onlyPluginIds === undefined ? "__unscoped__" : JSON.stringify(params.onlyPluginIds);
   const setupOnlyKey = params.includeSetupOnlyChannelPlugins === true ? "setup-only" : "runtime";
   const startupChannelMode =
     params.preferSetupRuntimeForChannelPlugins === true ? "prefer-setup" : "full";
@@ -378,7 +379,7 @@ function normalizeScopedPluginIds(ids?: string[]): string[] | undefined {
     return undefined;
   }
   const normalized = Array.from(new Set(ids.map((id) => id.trim()).filter(Boolean))).toSorted();
-  return normalized.length > 0 ? normalized : undefined;
+  return normalized;
 }
 
 function matchesScopedPluginRequest(params: {
@@ -442,19 +443,19 @@ function buildActivationMetadataHash(params: {
 }
 
 function hasExplicitCompatibilityInputs(options: PluginLoadOptions): boolean {
-  return Boolean(
+  return (
     options.config !== undefined ||
     options.activationSourceConfig !== undefined ||
     options.autoEnabledReasons !== undefined ||
     options.workspaceDir !== undefined ||
     options.env !== undefined ||
-    options.onlyPluginIds?.length ||
+    options.onlyPluginIds !== undefined ||
     options.runtimeOptions !== undefined ||
     options.pluginSdkResolution !== undefined ||
     options.coreGatewayHandlers !== undefined ||
     options.includeSetupOnlyChannelPlugins === true ||
     options.preferSetupRuntimeForChannelPlugins === true ||
-    options.loadModules === false,
+    options.loadModules === false
   );
 }