Thanks for the confirmation! I do appreciate it.
This visual bug has been a real bugbear for me. I can't reproduce it myself, and I can't find good information out there on what might be going on. Given how long this bug has been haunting me and how much it degrades some players' experience, I'm going to take that particle effect out of the full version. On the plus side, the overall graphics are getting a big upgrade, so I don't think it'll be missed as much :)