¿Cómo reemplazo un valor en una matriz plist usando plutil?

Estoy tratando de cambiar un valor en una matriz usando plutil, pero aparece el error

Failed to insert value new value 2 at key path PARENT.0.KEY_IN_ARRAY with error -[__NSCFConstantString characterAtIndex:]: Range or index out of bounds

Aquí hay una plist de muestra para ilustrar el problema:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>SIMPLE</key>
  <string>value1</string>
  <key>PARENT</key>
  <array>
    <dict>
      <key>KEY_IN_ARRAY</key>
      <string>value2</string>
    </dict>
    <dict>
      <key>KEY_IN_ARRAY</key>
      <string>value3</string>
    </dict>
  </array>
</dict>
</plist>

Modificar el valor SIMPLE es fácil:

$ plutil -extract SIMPLE xml1 -o - sample.plist 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<string>value1</string>
</plist>

$ plutil -replace SIMPLE -string "new value 1" sample.plist 

$ plutil -extract SIMPLE xml1 -o - sample.plist 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<string>new value 1</string>
</plist>

Obtener el valor de la matriz funciona bien:

$ plutil -extract PARENT.0.KEY_IN_ARRAY xml1 -o - sample.plist 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<string>value2</string>
</plist>

pero me sale el error cuando trato de modificar este valor:

$ plutil -replace PARENT.0.KEY_IN_ARRAY -string "new value 2" sample.plist 
sample.plist: Could not modify plist, error: Failed to insert value new 
value 2 at key path PARENT.0.KEY_IN_ARRAY with error -[__NSCFConstantString 
characterAtIndex:]: Range or index out of bounds