Not that I have an answer, but I have a similar issue. I have never in the 4 years of having my car, been able to open the glass. The tailgate button used to be slow like yours, but has now stopped working altogether. The release for the glass (the one under the wiper), has only ever also only opened the tailgate, never the glass.
I am thinking mine has been repaired at some point in it's life and wired wrongly. If anyone knows a fix it would be great to know.
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