diff --git a/package.json b/package.json
index 30736a1..5bdc06f 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "@push.rocks/smartpromise": "^4.0.3",
     "@push.rocks/smartrequest": "^2.0.21",
     "@push.rocks/smartrx": "^3.0.7",
-    "@push.rocks/smartstream": "^3.0.27",
+    "@push.rocks/smartstream": "^3.0.28",
     "@push.rocks/smartunique": "^3.0.6",
     "@push.rocks/smarturl": "^3.0.7",
     "@types/tar-stream": "^3.1.3",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a83a2bb..a96bf72 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -21,8 +21,8 @@ dependencies:
     specifier: ^3.0.7
     version: 3.0.7
   '@push.rocks/smartstream':
-    specifier: ^3.0.27
-    version: 3.0.27
+    specifier: ^3.0.28
+    version: 3.0.28
   '@push.rocks/smartunique':
     specifier: ^3.0.6
     version: 3.0.6
@@ -747,7 +747,7 @@ packages:
       '@push.rocks/smartpath': 5.0.11
       '@push.rocks/smartpromise': 4.0.3
       '@push.rocks/smartrequest': 2.0.21
-      '@push.rocks/smartstream': 3.0.27
+      '@push.rocks/smartstream': 3.0.28
       '@types/fs-extra': 11.0.3
       '@types/glob': 8.1.0
       '@types/js-yaml': 4.0.8
@@ -964,8 +964,8 @@ packages:
       through2: 4.0.2
     dev: true
 
-  /@push.rocks/smartstream@3.0.27:
-    resolution: {integrity: sha512-ZIYYS/dVQab+BP2LIP4u4uUn1oqvRvb/vPUabirhyBJwF8VBYC3ssDp9P+oYcuZ3i+Od0G4g1GQuhtFWNv6hgw==}
+  /@push.rocks/smartstream@3.0.28:
+    resolution: {integrity: sha512-OYKSjjyQj5h9+bxz4cHfUCpbYGHjB3TvseAY/3gWOrli7neGIPg7ycCDiiUYXfYQuPjof9GMzuBsAy4cpiyFNA==}
     dependencies:
       '@push.rocks/lik': 6.0.12
       '@push.rocks/smartpromise': 4.0.3
diff --git a/test/test.ts b/test/test.ts
index 5722b37..26223f1 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -38,7 +38,7 @@ tap.test('should extract existing files on disk', async () => {
   await testSmartarchive.exportToFs(testPaths.nogitDir);
 });
 
-tap.skip.test('should extract a b2zip', async () => {
+tap.test('should extract a b2zip', async () => {
   const dataUrl = 'https://daten.offeneregister.de/de_companies_ocdata.jsonl.bz2';
   const testArchive = await smartarchive.SmartArchive.fromArchiveUrl(dataUrl);
     await testArchive.exportToFs(
@@ -47,4 +47,4 @@ tap.skip.test('should extract a b2zip', async () => {
     );
 })
 
-tap.start();
+await tap.start();
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 0afc967..e8acf91 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartarchive',
-  version: '4.0.16',
+  version: '4.0.17',
   description: 'work with archives'
 }
diff --git a/ts/bzip2/index.ts b/ts/bzip2/index.ts
index 76d57ac..e42deee 100644
--- a/ts/bzip2/index.ts
+++ b/ts/bzip2/index.ts
@@ -55,7 +55,7 @@ export function unbzip2Stream() {
   return new plugins.smartstream.SmartDuplex({
     objectMode: true,
     name: 'bzip2',
-    // debug: true,
+    debug: true,
     highWaterMark: 1,
     writeFunction: async function (data, streamTools) {
       // console.log(`got chunk ${counter++}`)
diff --git a/ts/classes.archiveanalyzer.ts b/ts/classes.archiveanalyzer.ts
index eec05e1..93839ae 100644
--- a/ts/classes.archiveanalyzer.ts
+++ b/ts/classes.archiveanalyzer.ts
@@ -52,11 +52,10 @@ export class ArchiveAnalyzer {
     const analyzerstream = new plugins.smartstream.SmartDuplex<Buffer, IAnalyzedResult>({
       readableObjectMode: true,
       writeFunction: async (chunkArg: Buffer, streamtools) => {
-        const fileType = await plugins.fileType.fileTypeFromBuffer(chunkArg);
-        const decompressionStream = await this.getDecompressionStream(fileType?.mime as any);
-        resultStream.push(chunkArg);
         if (firstRun) {
           firstRun = false;
+          const fileType = await plugins.fileType.fileTypeFromBuffer(chunkArg);
+          const decompressionStream = await this.getDecompressionStream(fileType?.mime as any);
           const result: IAnalyzedResult = {
             fileType,
             isArchive: await this.mimeTypeIsArchive(fileType?.mime),
@@ -64,8 +63,9 @@ export class ArchiveAnalyzer {
             decompressionStream,
           };
           await streamtools.push(result);
-          return null;
         }
+        await resultStream.backpressuredPush(chunkArg);
+        return null;
       },
       finalFunction: async (tools) => {
         resultStream.push(null);