The parsing to turn Rules elements into filters for OpenCover doesn't catch " characters being input and escape them.
This is very useful, as we can set a rule of something like -" -excludebyattribute:*.ExcludeFromCodeCoverage* -hideskipped:All which then passes desired arguments to OpenCover that aren't catered for by the add-in.
It would be great if this was an official feature though, perhaps including a checkbox for-excludebyattribute:System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute since about the only reason someone with that attribute in their code might not want it excluded, would be as a temporary messure.