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OAProperties.Item can't find "URL" index
I'm creating a language service for a simple DSL. While working in the experimental hive, MPFProj quite often throws an exception in OAProperties.Item when the index argument equals "URL". The call stack shows nothing but [External Code] and
this function. The exception occurs when I close the solution or exit Visual Studio, but it also occurs sometimes when I open the project. I can't seem to determine the origin of the "URL" property, why it's needed, or how to provide it.