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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.

Project: platform/frameworks/support
Branch: androidx-main

commit 4f66c0ca1f324426a862a707597573d6bd8c0f01
Author: Alan Viverette <alanv@google.com>
Date:   Thu Dec 16 15:28:48 2021

    Add workaround method for addressing cache invalidation on SDK < 33
   
    This method is not very discoverable, but it's also pretty niche. Those
    who need it will probably find it via StackOverflow or Buganizer.
   
    Relnote: """Added method for working around ColorStateList issues
        resulting from Theme-keyed caching and Theme.applyStyle"""
    Test: ResourcesCompatTest
    Fixes: 207739887
    Change-Id: I9188bbf6b182111b3d6d302b81b9a000058687bd

M       core/core/api/restricted_current.txt
M       core/core/src/main/java/androidx/core/content/res/ResourcesCompat.java
M       core/core/api/public_plus_experimental_current.txt
M       core/core/src/androidTest/java/androidx/core/content/res/ResourcesCompatTest.java
M       core/core/api/current.txt

https://android-review.googlesource.com/1927081