I started a beta test with your extension mentioned here. But I figured out that only changing manifest to API34 is useless. Then I used Enhancer given here Enhancer : A powerful tool to change API level, inject assets, dex, manifest, resources & native (.so) libraries and sign the APK
But this doesn’t work. Google sees it as targeted SDK is API33 even I did all the things written in Enhancer. So I did a different thing. After using enhancer, I decompiled the apk with apkeasytool. Although after decompilng it shows as API34. I manually opened the manifest file and changed small things related to my app usage and recompiled it agin with apkeasy. After that I send the file to my phone and used APK to AAB converter but this time I used different keystore file and build the AAB. Then I send it to google then booom. It says your app is OK now, it is API 34! But I don’t know if it really worked. I am waiting for the bug reports from the different kinds of anroid phones to say that this work like a charm. But I want to thank you again for the effort to help me. I ıhope everthings gonna be fine 
edit: 1 bug report came now:
Exception java.lang.RuntimeException: Error while disconnecting UiAutomation@34526e8[id=-1, displayId=0, flags=0]
at android.app.UiAutomation.disconnect (UiAutomation.java:451)
at android.app.Instrumentation.finish (Instrumentation.java:272)
at androidx.test.runner.MonitoringInstrumentation.finish (MonitoringInstrumentation.java:9)
at androidx.test.runner.AndroidJUnitRunner.onStart (AndroidJUnitRunner.java:20)
at android.app.Instrumentation$InstrumentationThread.run (Instrumentation.java:2402)
Caused by android.os.DeadObjectException:
at android.os.BinderProxy.transactNative
at android.os.BinderProxy.transact (BinderProxy.java:584)
at android.app.IUiAutomationConnection$Stub$Proxy.disconnect (IUiAutomationConnection.java:471)
at android.app.UiAutomation.disconnect (UiAutomation.java:449)
I don’t know what is wrong but I think this is not extension related thing…