Whiteboard annotations disappear over some system apps during screen share

During a screen share session, the whiteboard annotations disappear when some system apps are brought to the foreground. We started noticing this as of Android 10. For an example, please see this video which shows the whiteboard annotations disappearing over the Android system settings app on Android 11.

Steps to reproduce:

Start a screen share session on a device running at least Android 10
Enable whiteboard annotations and add some to the screen share
Open the Android system settings app
Whiteboard annotations disappear
Navigate out of the Android system settings app
Whiteboard annotations reappear

Running adb shell dumpsys window windows, it looks like there's a hidden, system-level flag - HIDE_NON_SYSTEM_OVERLAY_WINDOWS - on the Android system settings window that will cause any other window that requires SYSTEM_ALERT_WINDOW to be hidden while that window is visible:

Window #6 Window{7ddc0ef u0 com.android.settings/com.android.settings.Settings}:
    mDisplayId=0 rootTaskId=8502 mSession=Session{1044e91 16661:1000} mClient=android.os.BinderProxy@5c729ce
    mOwnerUid=1000 showForAllUsers=false package=com.android.settings appop=NONE
    mAttrs={(0,0)(fillxfill) sim={adjust=resize forwardNavigation} ty=BASE_APPLICATION wanim=0x10302f2
      fl=LAYOUT_IN_SCREEN LAYOUT_INSET_DECOR SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS
      pfl=FORCE_DRAW_STATUS_BAR_BACKGROUND HIDE_NON_SYSTEM_OVERLAY_WINDOWS FIT_INSETS_CONTROLLED
      vsysui=LAYOUT_STABLE LAYOUT_HIDE_NAVIGATION LIGHT_STATUS_BAR LIGHT_NAVIGATION_BAR
      apr=LIGHT_STATUS_BARS LIGHT_NAVIGATION_BARS
      fitSides=}

From the same command, we see a note about the Android system settings app hiding system alert windows:

Hiding System Alert Windows:
  #0 Window{7ddc0ef u0 com.android.settings/com.android.settings.Settings}:

Since the cause seems external to this SDK, I'm not sure if there's anything that can be done here. Perhaps this could be noted in the documentation/codelab?

LogmeinRescue / Android-SDK

Whiteboard annotations disappear over some system apps during screen share #51