Hi, not sure if it's with other creatures because I'm in daily oratan prospector mode only at the moment. So I made a video of me not being able to hit oratan prospectors from far with my combustive chip. It also does it with other weapons tough. Going near the creature deblocks it but that means i'm getting hit and I have to heal allot more then I used too + I lose allot of time. Thanks for checking it out.
The recent platform update introduced some hitbox issues, I suspect that is the cause of your issue here as well if it started recently.