That does seem like a bug. I'm not able to reproduce it, unfortunately.
If you provide the session file, i can have a go at solving the mystery.
In case you prefer to do it in DM:s, my discord ID is FrankenGraphics#3272
It's certainly possible to have a look at expanding some clipboard actions in that regard. I can't say when that might happen, but it's already an item on my todo list. :)
It's strange, I can't reproduce the error, both the day I reported it and today when I sent the message it failed, moreover, before replying this morning I re-downloaded the application to make sure and even though I restarted the program a couple of times, configuring it to export only the attributes, the output file only contained what I mentioned. I really don't know what's going on.