Security Update 2019-003 (High Sierra and Sierra)

I had the same problem on a Macbook with High Sierra and I suspect it was tied to 2019-003 but your’s is the only mention I found on the Internet. I tried everything; deleting the Bluetooth preferences file, remove all devices, reset Bluetooth module, creating a new user, boot into Safe mode. Nothing worked.

The only thing that fixed it was updating to Mojave.

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