OVR Lip Sync Morph Target allocating more Blendshapes than necessary

Hi, I've set up the 15 visemes for my character, and on play mode, I can't use the blendshape 'vrchat_blink' because the script  'OVR Lip Sync Context Morph Target' is reserving blendshapes from 0 to  15 instead of 0 to 14 when I set 'Viseme to Blend Targets' array to 15.