I had a different problem and it was probably my own fault for not being more observant.
A few months ago while our propane grill was lit, flames started coming out of the connection between the propane tank and the hose.
I immediately shut the burners off, and when I went to shut off the tank, I had to reach through the flames. I then made the cardinal mistake of turning the valve the wrong way and there was an immediate whosh of bigger flames, and they were right beside our wood shingled house. I tried once again to reach into the flames to turn the valve the correct way and naturally burned a couple of my fingers pretty badly before giving up and heading toward the fire extinguisher.
When I went to pull the safety pin, no matter how hard I tried, it wouldn't pull out. Now I was paniking and gave a mighty yank with my finger and almost took my finger off cutting it badly.
I was then able to get the flames out, and when I examined why the pin wouldn't come out found that there was one of those tiny plastic tie wrap type things with the little tiny balls that evidently had the price tag attached to it at the store.
Thankfully the whole situation turned out OK except for the burns that took almost a month to heal and the cut.
Needless to say I went around the house and pulled the pin on every one of four other extenguishers
Jack L