diff --git a/packages/next/server/base-server.ts b/packages/next/server/base-server.ts
index 92f555cabff3..56f0dedf8a1d 100644
--- a/packages/next/server/base-server.ts
+++ b/packages/next/server/base-server.ts
@@ -1177,8 +1177,11 @@ export default abstract class Server {
     if (opts.supportsDynamicHTML === true) {
       const isBotRequest = isBot(req.headers['user-agent'] || '')
       const isSupportedDocument =
-        !!(components.Document as any)?.__next_internal_document ||
-        typeof components.Document?.getInitialProps !== 'function'
+        typeof components.Document?.getInitialProps !== 'function' ||
+        // When concurrent features is enabled, the built-in `Document`
+        // component also supports dynamic HTML.
+        (this.renderOpts.reactRoot &&
+          !!(components.Document as any)?.__next_internal_document)
 
       // Disable dynamic HTML in cases that we know it won't be generated,
       // so that we can continue generating a cache key when possible.