I have encountered a few myself in the open world. Though one of them I was able to walk though after a couple of seconds. It felt like the server just forgot where I was for a moment then realized I should be able to continue walking.
I come across invisible walls across the road probably every 20 minutes, here and there randomly. If I back up a few steps and wait for about 5-10 seconds, I can usually go on through. The problem needs fixed and has even gotten me killed a couple times.