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Trying to reproduce this on my 4.2.2 (v17) Nexus 4. Added this drawable:

<transition xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/test_drawable_blue"/>
    <item android:drawable="@drawable/test_drawable_green"/>
</transition>

where blue/green drawables look like this:

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <size
        android:width="@dimen/drawable_large_size"
        android:height="@dimen/drawable_small_size" />
    <solid
        android:color="@color/test_blue" />
</shape>

Then added this test:

    @Test
    public void testMutateTransitionDrawable() {
        Drawable drawable = ResourcesCompat.getDrawable(mResources,
                R.drawable.test_transition_drawable, null);
        assertTrue(drawable instanceof TransitionDrawable);

        Drawable mutated = drawable.mutate();
        assertTrue(drawable instanceof TransitionDrawable);
        assertTrue(mutated instanceof TransitionDrawable);
    }

It passes on the device. Going to also try on other earlier devices a bit later in the day once they are charged.

Also not reproducible on Galaxy Nexus running 4.0.1 (v14), 4.0.4 (v15) and 4.2.2 (v17)

https://android-review.googlesource.com/c/platform/frameworks/support/+/960032 with the test. Closing as not reproducible. If this is still happening for you, we'd need to see either a test (same as in this CL) or a small, standalone sample project that reproduces this issue on v17 (or other) devices.

Re UserStyleSetting I'm not sure I see the problem, it's a sealed class, this won't trip devs up.

Renderer.kt isn't currently sealed but probably should be and the same argument would apply.

Project: platform/frameworks/support
Branch: androidx-master-dev

commit b053d71fb7188ccaef8fb5a871a8dec57f05aa3b
Author: Alex Clarke <alexclarke@google.com>
Date:   Mon Nov 30 15:17:09 2020

    WatchFace Make Renderer a sealed class
   
    Bug: 173803230
    Test: Presubmit
    Relnote: Renderer is now a sealed class. This means CanvasRenderer and GlesRenderer are now inner classes of Renderer.
    Change-Id: Iab5d4cf05f02a2ed3a47729c32fac6b6e6cf23dc

M       wear/wear-watchface-complications-rendering/src/test/java/androidx/wear/watchface/complications/rendering/ComplicationDrawableTest.java
M       wear/wear-watchface/api/current.txt
M       wear/wear-watchface/api/public_plus_experimental_current.txt
M       wear/wear-watchface/api/restricted_current.txt
M       wear/wear-watchface/samples/src/main/java/androidx/wear/watchface/samples/ExampleCanvasAnalogWatchFaceService.kt
M       wear/wear-watchface/samples/src/main/java/androidx/wear/watchface/samples/ExampleCanvasDigitalWatchFaceService.kt
M       wear/wear-watchface/samples/src/main/java/androidx/wear/watchface/samples/ExampleOpenGLWatchFaceService.kt
M       wear/wear-watchface/samples/src/main/java/androidx/wear/watchface/samples/KDocExampleWatchFace.kt
D       wear/wear-watchface/src/main/java/androidx/wear/watchface/CanvasRenderer.kt
D       wear/wear-watchface/src/main/java/androidx/wear/watchface/GlesRenderer.kt
M       wear/wear-watchface/src/main/java/androidx/wear/watchface/Renderer.kt
M       wear/wear-watchface/src/test/java/androidx/wear/watchface/TestCommon.kt
M       wear/wear-watchface/src/test/java/androidx/wear/watchface/ui/WatchFaceConfigUiTest.kt

https://android-review.googlesource.com/1512984