Capture.list() fails if (MacOS) laptop is closed in dock mode

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Just discovered a strange bug while trying the Capture reference to list available cameras on MacOS (10.13.6) laptop in dock mode (closed lid, external monitor). No camera's were listed and code silently crashed.. nothing in draw processed... nevertheless, if removing the Capture.list(), it successfully loads the first camera it finds (an external USB cam or virtual camera) if only using the following code: cam = new Capture(this, 640, 480);. Upon opening laptop, it works as expected.

Hardware: MBP 2018 MacOS: 10.13.6 Processing: 3.5.4