This has been happening for a couple of months already, at random (sometimes it will happen, sometimes it won’t) and when it does I can not target heroes, not enemies nor allies. It only happens in the space between lanes or around the payload.
Just out of curiosity, did you play this match on a Mac or Macbook, or laptop with Intel HD GPU?
It’s on a MacBook Air
Not surprised, the game is a buggy mess on Mac now. This user on the Mac support forum also mentioned the exact same graphics glitch in the middle of Hanamura as you.
There is no real fix for 1+ year now except playing through using Mac’s Bootcamp to install Windows 8/10 to play the game.
They said the OS X client is being “worked on” though.