Can you post screenshots or video about your weapon and warframe loadout? I'm not sure how you would get this since the Tonkor has a "safety fuse" that prevents it exploding until it's traveled a minimum distance.
This thread was added on April 13, 2020, with posts from [DE]Momaw.
Not able to make it hit me midair, can get it quite reliably by wall hopping though. Thanks for the mind-bending bug report 😄