Copy and paste issue using Quicksilver

Hi,

I'm on a Mac (10.15.1) using the Quicksilver launcher. Quicksilver has a clipboard manager, similar to the built-in one in Intellij. If I copy text from inside a file in Intellij, then try to paste it back into Intellij using Quicksilver, it is pasted in XML format, e.g. the string 'jetbrains cut and paste' is pasted as:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <array>
    <data>
      amV0YnJhaW5zIGN1dCBhbmQgcGFzdGU=
    </data>
  </array>
</plist>

The copied text is is displayed normally in Quicksilver but is listed as type 'RTF text'. This seems to be the key difference.

I don't have any issues pasting into other apps, or copying from other apps then into Intellij.

Obviously I could use the Intellij clipboard manager but I would prefer to use the same one system-wide. 

Is there a setting or workaround for this? Thanks.