NDEF autostart never gets unregistered on Symbian (NFC)

Steps to reproduce:
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1. Create an autostart tag with type name: "urn:nfc:ext:nokia.com:nfccorkboard" (more instructions here: https://bugreports.qt.nokia.com/browse/QTMOBILITY-1836)
2. Install an app that registers for ndef autostart on Symbian. You can use v1.3+ of Nfc Corkboard: https://projects.developer.nokia.com/nfccorkboards
3. Verify that autostart works (you might have to start the Nfc Corkboard app and then restart the phone).
4. Now, uninstall the app again.

Expected outcome:
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When touching the autostart NFC tag, the phone should show "Unable to read tag. Format not supported.", as no app is registered with the record type anymore.

Actual outcome:
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Instead, nothing happens and the tag is ignored.

So, even if the ndefhanler_xxx.xml file is removed from its directory, some reference still seems to stay in the internal database of the Qt Mobility Autostart handler.

Calling QNdefManager::unregisterNdefMessageHandler() when closing the app doesn't change anything. I don't think this should be required anyway - just tried to make sure.