I have found an error with my code. The seed phrase had no connection with the private key, which it would make it impossible to restore it with the seed phrase it printed.
An AI search helped me detect it.
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So you 've posted some code which, if used by someone, would lead to them losing their money.
You clearly state that you want to learn, so please, at the top of the original post, write a warning. Something like "educational purposes only". Just to make sure that anyone won't be lazy enough to skip your intro and go straight to your code and use it.