The adapter isn't that complicated, it has a LED, two resistors and either a diode or a capacitor (can't see the markings on it).

Anyway I opened up the adapter and removed the "electronics" (such as they are) so that it is now just a simple plug. It now works fine.

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Unit serial number 47 (was 330 in the queue)...
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Remind me to change my signature to something more interesting someday