Hmmm... This is interesting and I will investigate further when I am back at my computer later. The thing is, it's only occurred for me so far when I had the plugin enabled, and I have failed to recreate it so far with the plugin disabled or when running vanilla rpg maker. I suppose I should check the section of code mentioned on the page you linked to see what it looks like in my project, and try hitting the refresh key a few times with the dev tools open and plugins turned off. Thanks!
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Yup, it looks like this is just a vanilla RPG maker problem. It happens if I keep opening the DevTools while refreshing, but I haven't seen it yet without opening the dev window. Strange bug. I thought it went away after I commented your code because, by coincidence, I must also have not had the dev window open when I tested at that time. Hope they fix it in future as it will make debugging somewhat frustrating at times. Maybe I should just go deeper myself and include an override of the method in question in my own code, if I can get around it that way. Thanks for your help!