I've encountered the same problem.
And My Code is Example Code

Launching lib\main.dart on Android SDK built for x86 in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\apk\debug\app-debug.apk.
D/FlutterActivity(20740): Using the launch theme as normal theme.
D/FlutterActivityAndFragmentDelegate(20740): Setting up FlutterEngine.
D/FlutterActivityAndFragmentDelegate(20740): No preferred FlutterEngine was provided. Creating a new FlutterEngine for this FlutterFragment.
D/FlutterActivityAndFragmentDelegate(20740): Attaching FlutterEngine to the Activity that owns this Fragment.
D/FlutterView(20740): Attaching to a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@92659dd
D/FlutterActivityAndFragmentDelegate(20740): Executing Dart entrypoint: main, and sending initial route: /
Debug service listening on ws://127.0.0.1:53232/RhhtyH1HfHI=/ws
Syncing files to device Android SDK built for x86...
D/EGL_emulation(20740): eglMakeCurrent: 0xa17064a0: ver 2 0 (tinfo 0xa1703df0)
D/EGL_emulation(20740): eglMakeCurrent: 0xa1705f00: ver 2 0 (tinfo 0xa1703cc0)
D/EGL_emulation(20740): eglMakeCurrent: 0xa1705f00: ver 2 0 (tinfo 0xa1703cc0)
I/zygote (20740): Do partial code cache collection, code=29KB, data=27KB
I/zygote (20740): After code cache collection, code=29KB, data=27KB
I/zygote (20740): Increasing code cache capacity to 128KB
I/zygote (20740): Do partial code cache collection, code=60KB, data=46KB
I/zygote (20740): After code cache collection, code=60KB, data=46KB
I/zygote (20740): Increasing code cache capacity to 256KB
I/ExoPlayerImpl(20740): Init 40d2b02 [ExoPlayerLib/2.9.6] [generic_x86, Android SDK built for x86, Google, 26]
D/NetworkSecurityConfig(20740): No Network Security Config specified, using platform default
I/VideoCapabilities(20740): Unsupported profile 4 for video/mp4v-es
I/OMXClient(20740): Treble IOmx obtained
D/SurfaceUtils(20740): connecting to surface 0x83234008, reason connectToSurface
I/MediaCodec(20740): [OMX.google.h264.decoder] setting surface generation to 21237761
D/SurfaceUtils(20740): disconnecting from surface 0x83234008, reason connectToSurface(reconnect)
D/SurfaceUtils(20740): connecting to surface 0x83234008, reason connectToSurface(reconnect)
E/ACodec (20740): [OMX.google.h264.decoder] setPortMode on output to DynamicANWBuffer failed w/ err -1010
I/ACodec (20740): codec does not support config priority (err -1010)
I/OMXClient(20740): Treble IOmx obtained
I/ACodec (20740): codec does not support config priority (err -2147483648)
D/MediaCodec(20740): [OMX.google.h264.decoder] setting dataspace on output surface to #103
D/AudioTrack(20740): Client defaulted notificationFrames to 1837 for frameCount 5512
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
D/ (20740): HostConnection::get() New Host Connection established 0x8abffe80, tid 20814
D/SoftwareRenderer(20740): setting dataspace on output surface to #103
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
D/EGL_emulation(20740): eglMakeCurrent: 0xa1705f00: ver 2 0 (tinfo 0xa1703cc0)
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
D/EGL_emulation(20740): eglMakeCurrent: 0xa1705f00: ver 2 0 (tinfo 0xa1703cc0)
I/zygote (20740): Do full code cache collection, code=123KB, data=89KB
I/zygote (20740): After code cache collection, code=97KB, data=63KB
I/zygote (20740): Do partial code cache collection, code=122KB, data=82KB
I/zygote (20740): After code cache collection, code=122KB, data=82KB
I/zygote (20740): Increasing code cache capacity to 512KB
I/ExoPlayerImpl(20740): Release 40d2b02 [ExoPlayerLib/2.9.6] [generic_x86, Android SDK built for x86, Google, 26] [goog.exo.core]
D/SurfaceUtils(20740): disconnecting from surface 0x83234008, reason disconnectFromSurface
I/ExoPlayerImpl(20740): Init b37ab9d [ExoPlayerLib/2.9.6] [generic_x86, Android SDK built for x86, Google, 26]
I/OMXClient(20740): Treble IOmx obtained
D/SurfaceUtils(20740): connecting to surface 0x80ea4008, reason connectToSurface
I/MediaCodec(20740): [OMX.google.h264.decoder] setting surface generation to 21237762
D/SurfaceUtils(20740): disconnecting from surface 0x80ea4008, reason connectToSurface(reconnect)
D/SurfaceUtils(20740): connecting to surface 0x80ea4008, reason connectToSurface(reconnect)
E/ACodec (20740): [OMX.google.h264.decoder] setPortMode on output to DynamicANWBuffer failed w/ err -1010
I/ACodec (20740): codec does not support config priority (err -1010)
I/zygote (20740): Background concurrent copying GC freed 43297(1752KB) AllocSpace objects, 131(8MB) LOS objects, 49% free, 3MB/6MB, paused 1.536ms total 104.184ms
I/OMXClient(20740): Treble IOmx obtained
I/ACodec (20740): codec does not support config priority (err -2147483648)
D/AudioTrack(20740): Client defaulted notificationFrames to 1837 for frameCount 5512
D/MediaCodec(20740): [OMX.google.h264.decoder] setting dataspace on output surface to #103
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
D/ (20740): HostConnection::get() New Host Connection established 0x80e4f680, tid 22180
D/SoftwareRenderer(20740): setting dataspace on output surface to #103
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
W/GrallocMapperPassthrough(20740): buffer descriptor with invalid usage bits 0x2000
D/EGL_emulation(20740): eglMakeCurrent: 0xa1705f00: ver 2 0 (tinfo 0xa1703cc0)
W/WM-WorkSpec(20740): Backoff delay duration less than minimum value
I/flutter (20740): Download task is enqueued with id(009c65ef-30d0-4011-8ae3-5c7b020a2522)

D:\mywork\flutter\flutter_tudou>flutter doctor run -v
[√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18362.657], locale zh-CN)
• Flutter version 1.12.13+hotfix.8 at D:\mywork\tool\flutter_windows_v1.7.8+hotfix.4-stable\flutter
• Framework revision 0b8abb4724 (3 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.1)
• Android SDK at D:\mywork\android_home
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.1
• ANDROID_HOME = D:\mywork\android_home
• Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.

[√] Android Studio (version 3.5)
• Android Studio at D:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.1
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 8.0.0 (API 26) (emulator)

• No issues found!

The callback function is not executed, the task status is "enqueued" in the database #191

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