This leak looks similar to a leak which already gets distinguished as a Library leak:

I'm not able to consistently reproduce this leak.

LeakTrace information

    ┬───
    │ GC Root: System class
    │
    ├─ android.view.WindowManagerGlobal class
    │    Leaking: NO (a class is never leaking)
    │    ↓ static WindowManagerGlobal.sDefaultWindowManager
    │                                 ~~~~~~~~~~~~~~~~~~~~~
    ├─ android.view.WindowManagerGlobal instance
    │    Leaking: UNKNOWN
    │    Retaining 643 bytes in 13 objects
    │    ↓ WindowManagerGlobal.mViews
    │                          ~~~~~~
    ├─ java.util.ArrayList instance
    │    Leaking: UNKNOWN
    │    Retaining 60 bytes in 2 objects
    │    ↓ ArrayList.elementData
    │                ~~~~~~~~~~~
    ├─ java.lang.Object[] array
    │    Leaking: UNKNOWN
    │    Retaining 40 bytes in 1 objects
    │    ↓ Object[].[0]
    │               ~~~
    ├─ android.widget.LinearLayout instance
    │    Leaking: YES (View.mContext references a destroyed activity)
    │    Retaining 5952 bytes in 31 objects
    │    View is part of a window view hierarchy
    │    View.mAttachInfo is not null (view attached)
    │    View.mWindowAttachCount = 1
    │    mContext instance of eu.unmatched.lynx.ui.activities.main.MainActivity with mDestroyed = true
    │    ↓ LinearLayout.mContext
    ╰→ eu.unmatched.lynx.ui.activities.main.MainActivity instance
    ​     Leaking: YES (ObjectWatcher was watching this because eu.unmatched.lynx.ui.activities.main.MainActivity received
    ​     Activity#onDestroy() callback and Activity#mDestroyed is true)
    ​     Retaining 95623 bytes in 1464 objects
    ​     key = 8da7d617-f46c-4f03-ba19-d9fe2bbcdb49
    ​     watchDurationMillis = 5189
    ​     retainedDurationMillis = 187
    ​     mApplication instance of eu.unmatched.lynx.MyApplication
    ​     mBase instance of androidx.appcompat.view.ContextThemeWrapper, not wrapping known Android context
    
    METADATA
    
    Build.VERSION.SDK_INT: 27
    Build.MANUFACTURER: POINTMOBILE
    LeakCanary version: 2.5
    App process name: eu.unmatched.lynx.lite
    Stats: LruCache[maxSize=3000,hits=1636,misses=38365,hitRate=4%]
    RandomAccess[bytes=1931040,reads=38365,travel=13137515160,range=12301429,size=15381381]
    Analysis duration: 11947 ms

2020-10-28_11-27-03_692.zip