It is somewhat anecdotal, but I had one of those and it blew out 2 usb-c docks. The first one went kaput about a month after I started using the magnetic adapter and I chocked it up to bad luck. The replacement fried about a week later and I put 2+2 to together and removed the adapter and haven't had any trouble over the last ~1 year.
All I can say is that I am glad it was the dock that fried not any of the laptops that use it...
That all said, it was pretty glorious when it worked -- a single magnetic cable that did dual 4k monitors, charging, videoconf setup, network, license dongles, etc
I would be surprised if those magnetic adapters handle disconnects properly.
USB-C connectors have pins of different lengths so device can detect them being disconnected, and do things like turn the power off. They also make guarantees that the ground pins are first to connect, and last to disconnect.
My guess would be that you disconnected your laptop while it was pulling lots of power. The pins got disconnected in the wrong order, which resulted in the electronics in the dock getting fried or a high voltage line for power delivery got momentarily connected to a data line, and fried something.
All I can say is that I am glad it was the dock that fried not any of the laptops that use it...
That all said, it was pretty glorious when it worked -- a single magnetic cable that did dual 4k monitors, charging, videoconf setup, network, license dongles, etc
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