This is a pretty old bug, I think I reported it a few years ago to Google.
EDIT: 2013 to be exact.
EDIT: 2013 to be exact.
https://bugs.chromium.org/p/chromium/issues/detail?id=168988
which links to another issue from 2012.
Edit: My purpose was to confirm the bug has been "known" for awhile, not to take away credit for you reporting the bug years ago. Congrats for independently discovering it before many people (such as myself) became aware of it.
For sure, I think its a very important bug that hasn't had much attention for years now, especially since so many websites use _blank, GMail being one of them.