It's probably a separate issue, but the problem is made worse by the fact that the extension seems to download months worth of such wrong information. And then moneydance is very weird about allowing me to delete such wrong information.
I am using a free stand-alone program that was originally developed to help out users of MS Money when Microsoft stopped supporting that product. The developer is actively supporting this software and has adapted it to work with Moneydance. This current build very stable and the quotes very consistent. Quote can be obtained for stocks & funds, from many stock exchanges US, Canada, UK, Europe and Australia to name but a few. The ability to convert quotes from one currency to another. Provide a means for importing all this data into Moneydance. You can also import exchange rates along with your security prices. The program is in java, like Moneydance and thus runs on Windows, Mac and Linux computers.
I entered the symbols for your security VG AsiaXJ EFT (2805) and a price in HKD was returned, see screen shot.