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I am aware the first 4 letters of each word are what is required to write down. Even in the washers method there is usually no space for all the letters, so only the first 4 to 5 letters are stamped. However, this does not mean human mistakes are impossible.Paranoid as I am of everything, I never store a seed without checking at LEAST three to five times whether I wrote down the correct words. Yet, there was one instance where I mistyped a word into another that also worked and it took me a pretty long time before I finally luckily found out where the problem was.
I'm paranoid too, believe me, I know what it's like
I check all the addresses before sending any transactions, and when I create a new wallet, I check it three times to make sure I've written everything down correctly and I'm still worried that I've written something wrong
When I won a cryptosteel in a raffle here on the forum, I learned that all I needed was the initial 4 letters and everything would be fine
It wasn't until I used it and was sure it worked that I was reassured and learned more about the BIP39 in that sense
One thing I see some users doing is adding a word, or failing to write one down, not writing it down anywhere
Today it may make sense, but in a few months you can easily forget and have a big problem guessing that word