You have my sympathy.
Unfortunately, you can be almost certain that something similar will happen in the future. It's pretty hard to get everything right all the time.
When I did a C147 last year, I similarly wasted 20+ days solving a matrix that turned out to be broken. The cause ended up being a corrupt file left over from a machine crash that the filtering stage had picked up and included. It took me a while to track the cause down.
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