After reading htis thread today I checked all my forks and stems regarding their insertion past the threaded part of the steerers. I only found one that was a concern, it has a lot of thread below the headset and a slightly shorter shafted ITM Eclypse. I have it as low as it will go and it is slightly overlapping the threaded area. So that one I will be changing the stem out when I can find a suitable one in the same reach. I found another that I just need to keep slammed (same shorter ITM Eclypse type) and the wedge is fully 20mm below the threaded part.
So I am very glad you are ok, and thanks for bringing this kind of thing to my attention!