It's a nice debugging story, but I actually thought it was a bit anti-climactic.

I say that because hardware that ignores irrelevant address bits is not really a rare or surprising thing. The more primitive/simple the hardware the more this is likely to happen. After all, "why bother" checking those bits or piping them through to a memory bus if they couldn't possibly affect the result?

It was however a nice description of the process by which the bug was reproduced and analyzed! Also, props to whoever managed to isolate that repro case.

PS: If you're into crazy game bugs, here's another one: https://twitter.com/mmalex/status/1066111290580582403